/r/gis

Photograph via snooOG

A community dedicated to everything GIS (Geographic Information Systems).

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/r/gis is a community dedicated to everything GIS (Geographic Information Systems). Please take a minute to read through the new Wiki page. If you don't find what you need jump in and submit new content.


What is GIS?

A geographic information system or geographical information system (GIS) is a system designed to capture, store, manipulate, analyze, manage, and present all types of spatial or geographical data. - Wikipedia


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Related Subreddits

We are trying to include as much as we can here at /r/gis but there is information spread out in other subs. Here are a few:

/r/gis

120,881 Subscribers

1

Internship options - technical GIS or GIS related business development

I have 2 internship offers (1) with an engineering firm using GIS to help with flood models and (2) a business development role with a company that has products that use GIS for client solutions.

I did similar work to the engineering firm work last summer. I have considered business development or consulting as a potential career path in the future but don't know if I should be in more technical roles in my first jobs to get experience first.

2 Comments
2025/02/03
22:53 UTC

1

Please, help me find a solution regarding aberrant data points in a cluster

Hello everyone,

I have a set of data that corresponds to all the GPS points made when a truck collects our customers. Sometimes the points are wrong because drivers enter coordinates manually after driving elsewhere. I'm looking to establish a mean or median center, ignoring outliers. I am looking for a tool, or several tools, that will help me detect aberrant data by weighting the points according to the distance between each entity corresponding to a customer or something similar. I have already tried several tools like NearTable, but several of these tools require that each client be separated into different shapefiles but this would be difficult for me because I have around 7000 clients to deal with having 10-20 GPS points per client.

Other info:

I only own Arcmap 10.8 but have most of the tools and extensions and FME 2023. I also own the microsoft office suite so Excel would be an option. I am not necessarily looking for a complete and direct procedure but rather possible solutions. English is not my primary language so I'm sorry if there is any confusion.

Thanks everyone!

Here is a picture of what I want to do :

https://preview.redd.it/yju6a3fprzge1.png?width=824&format=png&auto=webp&s=0e21436b7921921447d40bebfa363511cd8eafda

0 Comments
2025/02/03
21:28 UTC

2

Qfield connection to AWS or QGIS where synchronization does not occur

Apologies if this is more obvious but how do I connect QField to AWS that any attachments are sent to my S3 bucket. I easily get it right on QGIS but it does not transition to QFIELD. Is there any other way to add photos to my database layers so that they will be linked to QGIS without requiring synchronization in Geopackage format.

0 Comments
2025/02/03
21:13 UTC

21

Canadian GIS Employees - What looks good for applying up there?

I'm in the US, my Canadian wife and I are looking at immigrating up in the next year or so. That's a whole other thing that I don't want to address here. I will say we're looking out west (Alberta mainly).

I have a degree in GIS, however my current position only tangentially uses GIS. Moving up I'd like to get something more in line with my degree than what I'm doing now. If I'm going to start at the bottom, why not start in something I want to do. When applying up there, what looks good to employers? I'm looking at building up my portfolio while we work with Immigration Canada. I have a few things but definitely think I can plus it up before I start looking for anything. Thanks in advance.

36 Comments
2025/02/03
20:22 UTC

8

Worldwide SRTM archive/mirror

Is there a location to download all SRTM tiles worldwide without selecting each tile in NASA or the USGS EarthExplorer?

I’m wondering if there is a government site with a large zip file of preselected regions that would be easier than the current bulk download workflow. Thanks.

2 Comments
2025/02/03
19:46 UTC

115

Anyone Else Getting a 403 Forbidden Error When Downloading Mapping Files from census.gov?

I’m trying to download fresh TIGER/Line files, but every time I select a file to download, I get:

Forbidden

You don’t have permission to access this resource.

Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.

(I’m getting this both on my work computer and my personal device.)

What gives?

Does anyone know anything about this, or have any idea when it might be resolved?

39 Comments
2025/02/03
19:41 UTC

17

Fed UC

So you guys think this conference will still happen? Or consequently the turn out will be way down?

11 Comments
2025/02/03
17:37 UTC

1

"slide" show multiple views

I want to share multiple views of the same maps during different periods. What would you guys suggest to this? I will not be in the room when this is presented, so I am looking for an intuitive way to show this.

1 Comment
2025/02/03
17:09 UTC

7

Using ArcGIS in agriculture. Discussion.

So I am a agronomy student in some strange country in strange type of university, and one of the subjects I have is GIS. Although it doesn't affect anything in my studies in the sense that if, for example, I fail it, it doesn't block anything. It has no logical continuation in future. Not a single subject in my future studies is connected to this one. From what I come to conclusion that at least based on the curriculum itself it says that I don't need this subject. which made me ask, why does an agronomist need GIS? Maybe I don't understand something? I haven't come across this subject in any other university in the curriculum of the agricultural faculty. Does anyone have an answer?

10 Comments
2025/02/03
16:18 UTC

31

Low stress positions for decent pay?

I have around 5 years of experience with ArcGIS in the federal government and will be losing my position in the near-ish future. Most of my position is digitizing and some field work with collector. Every job posting i see feels like I don't have close to the experience required and it feels like my skills from college have slipped. Are these posted tech and analyst positions as difficult and stressful as they sound? I feel like I should start over again somewhere else to build up my Arc skills. What would be a good position to apply for that's not overwhelming?

24 Comments
2025/02/03
15:46 UTC

4

Anyone taken the Esri ArcGIS Utility Network Associate Certification?

Curious how it went and what you recommend brushing up on?

I have taken all 3 of the recommended courses (however its been almost 3-4 years)

2 Comments
2025/02/03
15:32 UTC

0

How do I find who built my neighborhood?

Hello! I have a cabin in the mountains of NC. I already looked at the GIS and it isn’t showing the info I want. (At least I don’t think it is). I have always wanted to know who developed the land and paved etc. I know this is a random question, but if you have any insight I truly appreciate it!! Thanks guys!

4 Comments
2025/02/03
14:08 UTC

0

Flood Plains

Has anybody found a way to import national flood plain boundary data? I found some KMZs but they are very large and won't import to our GIS. I did contact FEMA and they stated they do not provide a national file. We do not use ESRI.

I am also interested in wetland data as well which has been difficult to source a national file but I may explore some land use datasets to get that info.

13 Comments
2025/02/03
13:08 UTC

15

Can I transition from GIS to Data Science?

So I’m enrolling in a GIS postgraduate program, having graduate my bachelors in geography last year, I now want to do masters in GIS, however I’m also thinking if it’s possible that later on I can transition to data science?

Thanks

15 Comments
2025/02/03
07:39 UTC

15

Should I be worried

Hello, I am about to graduate soon , I had to do a portfolio at some point for school looking back at it now as I have gained experience I feel like some of them do not look great , not feeling proud about it and it's been like almost 5 years since I started learning gis , the projects are a couple years old, should I be worried or no? I am really hoping to produce great maps in the future.

7 Comments
2025/02/03
04:53 UTC

1

Null attributes after a table join in ArcGIS pro

Hi all, I'm working on some homework and had an issue I hoped someone would be able to help with. The assignment is to take data from the census and to import them into ArcGIS. I had a shapefile for census tracts In Missouri, and had to join a .csv with attribute data to it. Join went well, all one to one, but when looking at the attribute table afterwords, all values are <null>. Anyone know what could have caused this, or how I can fix it?

1 Comment
2025/02/03
03:53 UTC

4

Switching Careers into GIS

Looking for advice...

I graduated in 2021 with my BS in environmental science. While in college I took a GIS class. Since graduating I have been working in veterinary medicine, but now I'm wanting to switch gears into a job more related to my degree that also includes GIS. I'm looking for advice for how to get into the industry without experience (entry level work, internships, etc.) and how to go about finding them. Everything I've been finding online has been wanting experience or is located in a different state (I'm located in SoCal). I'd also love recommendations for resources to familiarize myself with GIS again since it's been a few years since I've used any GIS programs (I used ArcGIS in school).

Thanks!

10 Comments
2025/02/03
02:15 UTC

15

Continuing Remote Sensing PhD or leaving with Masters

I'm looking for career advice about continuing my PhD program in remote sensing or leaving the program with a masters in consideration of future employment opportunities in industry.

For reference, my undergrad degree is in Earth Science where I took a few GIS courses and worked with planetary data. I went straight into a PhD program in the US where I work on processing and post-processing InSAR data and developing algorithms to retrieve environmental signals. I also have gained experience acquiring and processing LiDAR, GNSS, and GPR data along the way.

I came into grad school wanting to do research, stay in academia, or work for the government, but I have since realized I'd like to work for industry. My main worry is becoming too hyperspecialized or overqualified for jobs that require at most a masters. Ideally I'd like to go in the remote sensing/GIS industry using some combination of sensors outside of the intelligence/national security area, but I'm also willing to pivot into the more geoscience realm (geophysics, geotech, enviornmental consulting).

I have a few years left in my program and could choose to stay and try and get internships in industry along the way, or I could leave and seek out those jobs inmediately. Would anyone have any advice on their perspectives of the worth and prevalence of holding a masters vs PhD in the remote sensing/GIS industry? Similarly, are there any companies you'd recommend looking into industry internships and jobs?

Thank you in advance!

6 Comments
2025/02/03
00:31 UTC

5

GIS bachelors worth it if I already have a minor in it?

Apologies if it’s a silly question. I graduated 4 yrs ago with my B.S in Geography with GIS as a minor. Overall goal is to land a job that is GIS heavy. I’ve been out of school for a while but I do try to keep up with Esri’s latest products and updates. I already complete the free Esri academy courses & MOOC certificates.

Be kind. Never posted to ask for advice. 🥺

Edit: I’m scared to apply for my Masters in Urban Planning because A) Ive been out of school for 4 yrs and B) my overall gpa when I graduated was not something I am proud of. I changed my major junior yr from Biology to Geography my junior yr because I kept flunking certain math and science courses which brought down my over all gpa. Once I changed my major, my overall grades increased! I really really loved all my GIS courses and did well in them.

15 Comments
2025/02/03
00:20 UTC

130

Am I too slow?

I work for a 100 person civil engineering firm and each of our big reports (with over 20-100+ billable hours) require 1-5 relatively basic GIS maps. I’m the only person in the company with a significant GIS background. I like to consider myself extremely efficient in the maps we make, with most maps only taking approximately 30 minutes each. Typically it’s just locating the site, adding in a few layers unique to the project, selecting proper symbology and exporting. Sometimes using a few basic spatial analyst tools. They’re too cheap to upgrade from ArcMap and do absolutely nothing to update data sets we use in our projects. Often I have to squeeze in obtaining updated data sets as well. My manager got mad at the amount of time i spent on this to the point he angrily emailed me one weekend saying we can’t be spending that much time on figures. I straight up told him to find someone else to do it faster. Other staff members have been doing the maps for over 3 months now and still spend over 5 hrs per figure and my manager is pulling his hair out. I think it’s funny.

42 Comments
2025/02/02
22:16 UTC

6

Are GIS Certifications Worth Their Merit?

Hello r/GIS community!

I’m looking to learn GIS so I can apply these skills in the natural resources workforce. My university offers a professional GIS certification that spans a 9 month length. My question is whether this certification would have any merit in a workforce environment. Do certifications show employers that the potential applicant has the skills needed for the job? Is there a cheaper way to learn GIS other than a professional certification? Thanks for your help.

4 Comments
2025/02/02
22:12 UTC

3

Houston Power Outage Data

Hello,

I’m currently working on a project and the project hinges on being able to find Historical Power Outage Data for Houston. I’ve searched ERCOT and NOAA, maybe I didn’t look hard enough but I genuinely couldn’t find anything, does anyone know of some sources where I can find this data? I’m willing to spend ~$100, if its some sort of paid API. I don’t need data from too far back just around 2016-Present. Thank you.

4 Comments
2025/02/02
21:35 UTC

1

Average Temperature Data for Tucson, AZ

Hey all. Apologies if this an easy google question, I was unable to find exactly what I need. I need average temperature data over the extent of Tucson, Arizona. I tried climateNA but as that only provides a single point, it is not helpful for me. Does anyone know where I can find that climate data? Thanks so much y'all!

4 Comments
2025/02/02
20:32 UTC

0

American looking for data in the UK?

Hello, I am a student studying urban design. I am having some trouble finding GIS data. I am looking specifically for transportation data for Cambridge. I was able to utilize some of the open data and also the ESRI living atlas for some data, but I am struggling in general. What are reliable and generally free sources? I am curious about what your experience has been like. I feel like data is less guarded and more open for the US.

3 Comments
2025/02/02
20:14 UTC

8

Unable to fix the unwanted split of polygons that go over the 180th meridian/international date line

Okay. I know from trying to troubleshoot this myself that this is an issue that has been brought up many times, with many responses/suggestions/solutions, on Slack Exchange, Esri Community, YouTube, here, etc.

However, nothing has worked for me.

The projection that I am using is WGS 1984 Web Mercator (auxiliary sphere) with wrapping around the date line. Previously, I had issues working past the 180th meridian, but thanks to a really helpful user on here, I was able to get past this by switching to Asia North Albers Equal Area Conic to create/edit anything that I needed past the 180th meridian, and then switching back to WGS 1984. The downside of this is that it takes forever for the refresh button to stop toggling if I so much as turn off the visibility of a layer, and I'm talking days here, not minutes or even hours. Fun times. Anyways.

Here is what I currently have:

This screenshot shows four polygon layers (a not-very-purple mauve, dark orange, light orange, and pale yellow) that are self-created geodatabase feature classes and one polygon layer (dark blue outline) that is a downloaded shapefile feature class. The first polygon layer is not an issue here, the other three + one are.

My issue is an unwanted line (which is actually a split) for any layers that happen to go over the 180th meridian line, also known as the international date line. It's not as simple as deleting the vertices of the line—the part of the polygon that is west of the dateline and the part of the polygon that is east of the dateline are not actually connected.

I have the least maneuverability with the shapefile feature class, so let's start there. I downloaded GADM's geopackage for the country of Russia and am using level-0. I edited the symbology so that it only has an outline color, no fill color, since all I want is the border. Unfortunately, there goes the quick and easy solution of just not having an outline, since that is what makes the 180th meridian obvious. And I'm pretty limited on alternatives, since this is the only border that I've found which:

  • a) ArcGIS Pro will accept, instead of showing the "Failed to add data" message;
  • b) actually has a symbology and can be edited, unlike a KMZ file;
  • c) does not include annexed Crimea.

A successful solution on Slack Exchange was to switch to Asia North Albers (which I did), project the polygon in that new coordinate system (which I did), and merge the two parts of the polygon. Now, I thought just from that thread, that all I had to do was move the vertices on top of each other until they snap together, hit the merge button, and I'd be good to go. Unfortunately, the snapping bit never happened, the merge tool insisted that I only had one feature selected, and the app ended up crashing.

I went to YouTube to learn how to merge, and found out that I really only did have one feature selected. Despite the split over the 180th meridian and the two sides not being connected, if I select the feature on either side of the meridian, the whole thing lights up. Looking at the attribute table for the border, it just shows this:

FIDShapeGID_0COUNTRY
10PolygonRUSRussia

But as you can clearly see here, they're not connected or even adjacent:

https://preview.redd.it/g8wllsk5xrge1.png?width=1246&format=png&auto=webp&s=8d12dd9ee4210b3aa73e6824a064dd58a46c92b4

I'm stuck here, because I don't know how to create a split within the attribute table when the polygon is already split by the 180th meridian, and that's preventing me from merging them in order to not have the issue of the unwanted split in the first place.

(I thought I found a work-around by exploding the polygon, which gave me 5,700 entries in the attribute table instead of just 1, though it looked the exact same as the photo above. I was then able to use the merge tool, but it landed me right back to square 0, where I have one entry in the attribute table and a split through the 180th meridian.)

And I have the same issue with the other three polygons, the ones that I created, which go over the meridian. Here are their attribute tables:

  • Darker orange:
OBJECTIDShapeShape_LengthShape_Area
11Polygon881492413.785893958434957129.017578
  • Lighter orange:
OBJECTIDShapeShape_LengthShape_Area
11Polygon721318516.5956616417017441294.027344
  • The darker orange layer is on top of the lighter orange layer. If I fix this issue in the darker orange layer, wouldn't it cover the same issue in the lighter orange layer? As in, I wouldn't have to also fix this in the latter layer?
  • Pale yellow:
OBJECTIDShapeShape_LengthShape_Area
11Polygon209679179.7374196736453412393.260742

Alternatively, if I can get the two sides to snap together, I might be able to dissolve the split?

Edit: Just realized that the only polygon that is actually problematic here is the one that I downloaded from GADM, since the others have no outline. 🤦 I just checked what it looks like without the blue border, and you can't see the split. So that's part of the problem solved.

2 Comments
2025/02/02
20:07 UTC

1

mapproxy: relaying XYZ tiles, question around upscaling and resampling

Hi, I'm using mapproxy to relay some online raster tiles for my personal use.

I have 2 issues:

  1. I can't manage to up-scale the most zoomed-in tiles obtained from the remote source. I'd like to do that otherwise some apps will have trouble displaying more zoomed-in tiles (e.g. OsmAnd will up-scale by itself, but won't automatically download less zoomed-in tiles... so I have to first zoom out and then zoom back in...; bikerouter will simply stop displaying anything when outside of the available zoom level range).
  2. The remote source is available only as 512x512 tiles. I'd like to convert remote tiles for zoom level Z in 512x512 format to 4x Z-1 256x256 tiles, if possible, e.g. remote tile https://remote.tiles/15/15000/10000.png should be cached/served as 14/7500/5000 14/7500/5001 14/7501/5000 14/7501/5001. Is that possible? I don't actually really care if some down-sampling is done if I can achieve serving the tiles in a [256, 256] grid instead of a [512, 512] one.

For 1, this is my related config:

grids:
  remote_grid:
    base: GLOBAL_MERCATOR
    tile_size: [512, 512]
    num_levels: 16
  relayed_grid:
    base: GLOBAL_MERCATOR
    tile_size: [512, 512]
    num_levels: 22

layers:
  - name: relayed_layer
    title: relayed layer
    sourced: [cache_remote_source]

caches:
  cache_remote_source:
    grids: [relayed_grid]
    sources: [remote_source]
    upscale_tiles: 6  # <-- this seems to have no effect

sources:
  remote_source:
    type: tile
    grid: remote_grid
    transparent: true
    url: https://...............

The documentation says https://github.com/mapproxy/mapproxy/blob/master/doc/configuration.rst. I believe I'm in these situations. Instead of resampling, mapproxy seems to just re-serve the exact same image as the corresponding lower-zoom. So for example, I can reach 15/15000/10000.png, but 16/30000/20000, 16/30000/20001, 16/30001/20000, 16/30001/20001 return images, but they all return... 15/15000/10000.png.

For 2, I have no idea how to proceed. If I use a grid that is in [256, 256], mapproxy will complain in the logs that the source and cache dimensions are different.

Any help is welcome! Thank you very much.

0 Comments
2025/02/02
19:26 UTC

461

Status of federal ArcGIS servers

Many readers here already know about the list I curate of 3,000+ ArcGIS server addresses.

https://mappingsupport.com/p/surf_gis/list-federal-state-county-city-GIS-servers.pdf

I just opened some federal ArcGIS addresses and everything seems to be alive and well. In particular I checked NOAA servers with climate data and they appear to be working fine.

Just a few days ago I discovered the CDC has an ArcGIS server at

https://onemap.cdc.gov/onemapservices/rest/services

Those CDC layers require a token. However, since I have not previously been monitoring that server I do not know if the requirement for a token is new or has always been in place.

I am much more of a software dev than a GISer. Late last year I *finally* took the time to work on my PHP code that scans the ArcGIS server addresses. Each week that PHP code runs 3 times as scheduled ‘cron’ jobs with a few hours in between each run.

Scan #1 reads the master list. If the status of an address cannot be determined then that info is added to an exception report.

Scan #2 reads the exception report produced by scan #1. If the status of an address still cannot be determined then that info is added to an exception report.

Scan #3 reads the exception report produced by scan #2. If the status of an address still cannot be determined then that info is added to an exception report.

I review the exception report produced by scan #3, update the master list accordingly and post an updated pdf file.

My original PHP scanning code was producing too many ‘false positives’ in the final exception report that I reviewed. So after a bunch of careful analysis I rewrote the scanning code. Using the much improved scanning code the final exception report has been reduced in size and it now takes about half as long as it used to for me to complete the weekly update. There still are maybe 75 or so servers that my code is having trouble reading. I am working on solving those issues.

14 Comments
2025/02/02
15:59 UTC

14

Is it worth learning civil3D?

I graduated with a GIS degree a year ago and have mostly been freelancing since then. Finding a full-time job has been challenging, either the opportunities are scarce, or the pay is too low.

Recently, a friend referred me to his company, which focuses on topographical survey data processing, alignment sheets, GIS-to-CAD and CAD-to-GIS conversions, profiles, etc. I don’t have experience with these specific tasks, but I feel like this job could be a great way to enter the industry.

Would it be worth learning these skills and applying? How difficult is it to transition into this type of GIS work without prior experience? Any advice from those who have worked in this area would be really helpful!

18 Comments
2025/02/02
15:31 UTC

2

Copy spatial location from one feature layer to another one based on matched attributes

I have an older feature class with incorrect spatial point locations and an updated feature class with the correct locations. Both have an address field, which I used to create a join between them.

I want to update the old feature class’s spatial location to match the new feature class's correct location, while still keeping the old dataset intact. Essentially, I need the old points to snap exactly to the new points based on matching attributes.

I already copied the X, Y values from the new feature class to the old one and updated the spatial geometry. However, while the points adjusted, they are close but not exactly aligned—they don’t overlay perfectly.

How can I ensure that the old points snap precisely to the new locations?

8 Comments
2025/02/02
11:05 UTC

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