/r/gis

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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

105,259 Subscribers

1

Data Organization and Versioning

Hey y'all,

I work for a medium-sized conservation non-profit, and part of my position's grant funding is dedicated toward GIS data organization. We have probably thousands of datasets from current and former staff, interns, and other organizations. My two major tasks are searching for duplication and versioning, and then cleaning and sorting the data.

To an experienced GIS professional, this question probably sounds pretty dumb, but what the heck is versioning? I've watched a few videos and read some documentation and I'm having so much trouble grasping the concept.

So I have two main questions:

  1. How do you or your organization sort your data in a way that is relatively navigable for others who are not in GIS-centric positions? Our biologists and scientists use GIS as a tool for their research, but are not specifically trained in the software.

  2. Is there a way you can explain versioning to me that a 6th grader would understand? None of my schooling covered this (Geography BA and GIS Grad Cert) and it's proving rather difficult for me to grasp.

Any and all help/advice/resources is greatly appreciated.

0 Comments
2024/04/19
16:32 UTC

3

Attempting to share an enterprise geodatabase view as a web layer yields error 000396 "The dataset version is later than is supported by your server" - is there a workaround for publishing views to ArcGIS Server version < 11.2?

Some additional context: I'm running PostgreSQL 14.8 + ArcGIS Server 11.1, and have a point feature class in an enterprise geodatabase. I created a view from the FC using the ArcGIS Pro Create Database View tool, and then the Register With Geodatabase tool on the view. I add the view to the map, right click the layer in the Contents panel, and select "Share as Web Layer." The publish process returns error 00396, indicating the minimum ArcGIS Server version to support this is 11.2. I'm wondering if there are any workarounds or alternate approaches to sharing a view on ArcGIS Server versions prior to 11.2.

The use case here is that the feature class contains a column named "iscomplete" and I would like to hide any records where iscomplete is false, as these have incomplete data and need further manual review. These points should not be visible to any end user or consuming application. The seemingly obvious approach here is to split the data across two feature classes, suffixed with "_complete" and "_incomplete" and publishing and sharing the "_complete" table, but I feel this is not great database design. It is a brittle solution as records would need to be deleted from one table and then inserted into the other, introducing the potential for loss of data integrity, and also requires maintaining two table schemas for identical data.

0 Comments
2024/04/19
14:15 UTC

2

Maxent graphic

Desperation post! I'm not a scientist but am trying to help a scientist recreate a graphic that another scientist created (which was modeled after a totally different scientist's work). Any scientist GISers here know how I can make the first image look more like the second image? I was given five different ascii files (average, min, max, stdv and median) that represent a maxent model of the subject (butterflies). I converted them (first image is the average file) to raster and put in the WGS84 coordinate system then classified as indicated in her paper (jenks 4 classes). A paper she referenced (text at the bottom) seems to indicate I need to do some additional processing--like some kind of overlay and equalizing of the rasters? I've been googling and talking with the guy who needs GIS help and we can't figure it out. Per chance anyone done this exact thing and can point me in the right direction?

https://preview.redd.it/fdfswle1wfvc1.png?width=683&format=png&auto=webp&s=4bcf07b49dd985e52395aa34dee4cd978ae7d0be

Here's the text from the cited paper: "We derived classification

breaks for each ENM (ecological niche model) using the Jenks Natural Breaks

(i.e., Jenks Optimization) classification method (Jenks

  1. available in ArcGIS, and then averaged these

break values across ENMs. This allowed us to

homogenize the break values so that comparisons

could be made across ENMs. Finally, we created a

consensus model to combine the three ENMs, which

identified the low, moderate, and high suitability areas

predicted as such by at least two ENMs. This

technique is akin to that of the consensus or ensemble

approach (Araújo et al. 2005; Araújo and New 2007),

which incorporates variability from multiple models

and identifies commonly predicted areas".

1 Comment
2024/04/19
14:03 UTC

0

Finding a elevation map

Hey I really need help, I'm trying to find a DEM map information for a really small place in Portugal, called Escarigo bc I need to do a cartography of that place but so far I couldn't find the elevation map for download, so I can do the contour lines on QGIS, someone can help me with this pls?

1 Comment
2024/04/19
12:48 UTC

2

Help! Data scraping a map

Hey there! someone here have experience data scraping maps?
i'd love to download the KML or SHP file of this map
https://trucksandfins.com/en/spots?f_skate=1&f_kw=&f_feature=&f_country=

is it possible? how could i do that?

4 Comments
2024/04/19
10:15 UTC

9

ESRI error adding invisible road across my property?

Hi-can someone help explain something to me in layman's terms?

My county GIS website randomly added a road cutting through my property, so I've been on a wild goose chase to figure out wtf is going on.

The county says it is a mistake with the basemap from ESRI software.

This road does not actually exist and is not on google maps, but I stumbled across the openstreetmaps site and there it is!

I'm trying to understand how this invisible road was added in the first place-does ESRI pull from OSM?

4 Comments
2024/04/19
10:06 UTC

1

Can I get region / provinces data from Natural Earth with an specific POV?

Hello,

I'm working in a project that uses Natural Earth data. Something I'm currently struggling with is that I want to be able to show different points of view (disputed borders), which at country level (admin-0 data) it's easy as in NE you can already get the different POV (e.g. China, India, Israel...). My problem comes when wanting to display more specific regions for specific countries, as the NE data for states and provinces (admin-1 data) is not provided with different POV, causing that in some cases the region data is not matching the country borders when using a non-standard POV.

Has someone also faced this? Is there any way to get states and provinces data for each POV? Or has anybody found some workaround for it?

Thanks

0 Comments
2024/04/19
07:22 UTC

2

Data Analyst —> GIS Analyst Roadmap?

Hello all,

I’m looking for some advice on how to most efficiently educate and qualify myself for a GIS Analyst position coming from a sales data analyst background . I have worked in healthcare for the past 4 years as a sales data analyst, and last year completed my Masters in Analytics and Information Management. I am proficient in Python, Sql, Tableau, Excel and Power BI.

I was recently laid off and given a decent severance so have been using my time to brainstorm some ways to combine my education/experience + passion of conservation, which has brought me here. (I think what you guys do is pretty awesome btw.)

There is a lot of information on getting started in the field but it can be a bit daunting and I don’t want to bounce around subjects/topics/platforms in an inefficient manner.

Is it a stretch to make this transition without a natural science background? If not, what are some preferred courses or roadmaps to get me up to speed on fundamental understandings and concepts without going from ground zero on programming languages and data processing?

Also, what would be some applicable positions to apply for given my background when I am familiar with the basics?

Thanks greatly in advance

3 Comments
2024/04/19
06:57 UTC

7

Water Utility Salary Audit - GIS Developer Type Role + Other Stuff

As of the new fiscal year, it looks like I will be taking on a new role from my current "GIS Coordinator" role. I am wondering how I am looking compared to the market, and also just interested in sharing for overall transparency in the field. For reference, I am located in the south, on the outskirts of a medium sized city. I have roughly 4 years of combined experience, am fluent in python, js,

My Current Role:

Currently, I am a sole GIS person for a small water utility. I do everything from field data collection, to create web applications (both with AGOL out of the box, the ExB SDK, and other Flask Apps.). I also assist with customer service.

In this role, I am currently making $50,000/yr with 100% insurance paid by the employer and 5% 401k contribution, and an annual bonus.

The New Role:

In my new role, I will still have my previous responsibilities +

  • Become responsible for managing our work order/inventory system (including building a custom application for this).

  • Become responsible for managing our backflow prevention program (including building a custom application for this).

  • Become responsible for managing water consumption and water loss for the utility.

With the new role, I will be making $63,000/yr with the same benefits + 75% reimbursement for the masters program I intend to start this year.

Overall, I feel like my salary without taking on the additional department/program management responsibilities should have been near $63,000 given the level of custom development, etc. However, I feel like when factoring in the benefits at the new level, I will be making out pretty nicely for still being "Early Career" and will come out with a Masters.

What are your thoughts?

16 Comments
2024/04/19
01:11 UTC

2

How do I get a Value to show up in my legend?

Hello, I'm wrapping up my first GIS class in college and I cannot, for the life of me, figure out what I need to do to replicate the original document.

I don't think I need to replicate the original Legend, but I would like to for readability and I'm having a hard time describing my issue in any way that Google can understand.

https://preview.redd.it/rr2cq7hulbvc1.png?width=656&format=png&auto=webp&s=856252e8338a952dde7e0b82bb26ddfb8def3500

https://preview.redd.it/8qsjicaylbvc1.png?width=1025&format=png&auto=webp&s=1094223bbd86541c309dfd3f76217ad203ce0d05

https://preview.redd.it/pezm50j2mbvc1.png?width=754&format=png&auto=webp&s=a57e4aaa3f2c9c0d3128e5ba4bf40579753726ce

8 Comments
2024/04/18
23:17 UTC

1

Insurance for GIS professionals (small business owners)

Background: I've been in GIS for 20 years and have a one-person-shop consulting business (based in FL, USA). I'm in the middle of insurance policy renewal season and am curious as to what other small business owners are carrying and the cost. I am generally required by clients to carry GL and E&O, but also carried cybersecurity insurance last year. Here are the estimates I'm receiving for renewals (prices in USD for one year of coverage):

GL: ~$1,000 ($1MM per occurrence/$2MM in aggregate or better)

Cyber: ~$1,000

E&O: ~$2,000 ($1MM per occurrence/$2MM in aggregate or better). This seems to be the minimum policy limits that I can obtain and that my clients will allow.

I've searched this forum and found $2,000 for E&O is probably a decent price (answers went up to about $3,000). Just wanted to check in and see what others are paying this year.

Related aside: Has anyone left the business/closed shop and obtained a tail policy?

1 Comment
2024/04/18
21:47 UTC

1

Looking for datasets of forest ecozones/ecological zones

I hope to study forest ecological zones / ecozones and am looking for a dataset that depicts these across the United States, or more specifically, Eastern USA. Any ideas?

4 Comments
2024/04/18
21:46 UTC

1

Geo pivot internship?

Anyone have experience with this? I was working as a lidar technician but my contract was not renewed, I am currently applying for jobs and I am hoping to go into a more GIS heavey position. My main barrier is experience, I have a degree but the internship I was supposed to do during my degree was cancled due to covid.

I am applying for every entry level position I can find including internships that don't require you to still be I school or positions that have gis but aren't directly a gis role, but I am getting nowhere.

I saw this online but I am worried it would just be a scam/ pointless.

Does anyone have experience with Geo pivot internships, it's a remote internship to get experience but you have to pay( hence why I think it's a scam). Normally I wouldn't bother with somthing like this but i cant seem to get anywere applying for jobs so I wish there was a way to get experience to help move the needle, I applied to some volunteer positions but never heard back. My other options are additional certificates like UAV licience or thermography( I have seen them on some job listing's but I don't know if they would help in general). Get my masters, I don't know if it would help but maybe it might make me eligible for more internship positions.

0 Comments
2024/04/18
21:37 UTC

6

What is the starting salary like in Alberta for a GIS technician? Should I upgrade my diploma to a geography degree?

I have my diploma in geomatics engineering technology and I am going to COGS for the advanced diploma in GIS this fall. After I'm done I'm hoping to get a gis technician job or something similar. What kind of salary can I expect as a GIS technician in Alberta? I have one year experience in land surveying and a 4 month coop as a geomatics technician with the federal government. Will this experience along with my diplomas help me land a GIS job? I also have the opportunity to upgrade my geomatics diploma to a geography degree with another 2 years of study. Would this be worth it if I already have the advanced gis diploma from COGS?

15 Comments
2024/04/18
19:34 UTC

2

Iceland Data

Is there a good source of free spatial data regarding Iceland, preferably in English? I found one source that I have to pay for, and the Iceland GIS portal is ... to no one's surprise... entirely in icelandic. If anyone has any leads for good data, it would be appreciated.

Edit: Thank you guys. I was able to find data I needed here and here:

National SDI - SDI Iceland (lmi.is)

HOTOSM Iceland Points of Interest (OpenStreetMap Export) - dataset by hot | data.world

For some reason, the SDI wouldn't translate to English the first time I used it, so I wasn't making much headway before.

5 Comments
2024/04/18
19:17 UTC

1

FeatureSetByName

I’m struggling to execute this the exact way I need it. I’m trying to write an arcade expression to return an attribute value from another layer on my map into my popup. My code is returning the first thing that intersects with my data although that’s not what I want and incorrect (I’ve tried to use Contains rather than Intersects but it won’t execute).

Here’s what I have so far:

var building = FeatureSetByName($map, “Buildings”); var prop = First(Intersects($feature, building)); var addr = prop.ADDR_ID; return addr

Does anyone know what I’m doing wrong/can send me some helpful documentation on how to correct this? Ideally I want to build my pop-up by pulling in attributes from other layers based on a key field but I haven’t been able to figure that out either. Thanks!

7 Comments
2024/04/18
18:42 UTC

1

Getting slope for 100k+ points

Anyone have any recommendations for finding the slope for over 100k points all within the state of California? I use ArcGIS Pro, I normally use the Summarize Elevation tool but it doesn’t work on more than 1000 points and the slope imagery on the Living Atlas is just too big for me to really do anything with it, I can’t even extract just the area I’m working with. Appreciate any recommendations!

1 Comment
2024/04/18
18:06 UTC

1

Help showing spatial relationship with two sets of data

I am working on a project and I am trying to show public street security cameras and bike lane locations. I have both sets of data in my project (bike lanes and cameras) but I am trying to only show the lanes that have cameras.

The data for the bike lanes and cameras have different syntax for the street names. Is there a way I can relate or join this data together to get it to allow me to show only the bike lanes that have cameras on them?

I am newer to gis but this is my first time showing a relationship between two separate sets of data. I have been looking at spatial join, and there are many options in there but none seem to be working.

5 Comments
2024/04/18
17:04 UTC

1

Join Resulting in Fields with Null Values

I am trying to join a CSV to using the common field GEOID. When I execute the join, the fields are added, but all the values are Null.

In the layer, GEOID is text data type and in the CSV, the same field is a Number data type. Is this the issue? I tried fixing this in excel but the GEOID codes are so long that if I convert them to text they end up in scientific notation.

Are there other aspects of this operation I should be considering?

5 Comments
2024/04/18
17:03 UTC

3

View from PostGIS Not Drawing in QGIS

I'm playing around with PostGIS in PostGres and trying to visualize Views in QGIS. For some of my views, I'm getting the strangely emphatic "Unavailable Layer!" message. I had this problem with some views I made a few days ago but eventually resolved it, but don't quite remember how! I think it may have had something to do with narrowing the view down with queries that returned only one row per geometry value.

Some rudimentary reading shows that unique integers might be the key for getting SQL queries to show up in QGIS. For my successfully visualized Views there are incidentally unique integer values but otherwise no Serial-type columns.

I've played around with getting Serial ID columns into my final view but it's built around a subquery with GROUP BY operators that don't seem to like the addition of another column. Am I missing something, or am I on the right track?

8 Comments
2024/04/18
16:55 UTC

1

Learning on My Own - Real Estate

Hey all, I’m am looking to develop more skills in my work place and I have an option for ArcGIS. I have little to no experience here but am skilled in excel, with some SQL and R experience too from business school(though it’s been a while - 3 yrs), mostly self taught.

If I want to use ArcGIS just for running things like commute analysis, how difficult is this going to be to teach myself?

Essentially if I go to my boss and say I want ArcGIS, and say I can deliver commute analysis for clients, is it feasible I can teach myself these skills in say 2-3 months? I know this is broadly speaking but is it generally doable?

Thanks!

2 Comments
2024/04/18
16:54 UTC

3

Most Useful ESRI Courses

Hey all, I currently have access to all of the ESRI training courses through my university but I'm graduating in December and want to get the most out of my subscription before then. I already have a good amount of knowledge and experience with arcpy and non-GIS cs skills but I am interested in gaining more development skills beyond that. Also, I have an internship with a utility company so some courses to prepare me and/or go along with the experience I gain from that to assist in finding a job after graduation would be super helpful. TIA!

0 Comments
2024/04/18
16:13 UTC

4

how’s the UK job market like for GIS?

Hi! How’s the job market like for GIS related jobs/internships, and are they open to international students on graduate visas?

Also, are they usually contract based or do companies look for long term employees (and thus avoid hiring people on graduate visas)?

what kinda jobs should i look out for, and what portals should i use? i googled entry level GIS jobs and only got 30 searches.

The degree I plan to study: BA Geography KCL, spatial data pathway

Thanks!

10 Comments
2024/04/18
15:31 UTC

3

Phone Geofence Alert App?

I am looking for an iPhone app that provides a notification when my phone crosses a geofence. Use case: I crossed city limits yesterday when doing site inspections and didn't realize it. I'm currently working off of paper copies and a list of addresses, no map (long story; will be electronic next year).

The city limits currently exist as a polygon AGO service.

6 Comments
2024/04/18
15:10 UTC

1

Does anyone know of any datasets for Easter Island (Rapa Nui)?

I'm looking for environmental data, soils, land cover, etc

I've done a google search but can't really find anything useful.

1 Comment
2024/04/18
13:37 UTC

1

Clipping Temporal raster in ArcGIS Pro

As part of a script I am running, I am clipping the  Sentinel-2 10m Land Use/Land Cover Time Series data from ESRI (https://www.arcgis.com/home/item.html?id=cfcb7609de5f478eb7666240902d4d3d) using Python. I was using the previous version no problem, however, with this version of the data, when I do my clip, as default it clips the oldest version of the raster, whereas I actually want the latest / most recent version of the land cover. Does anyone know if its possible to specify this in Python? 

esri_lulc = "https://ic.imagery1.arcgis.com/arcgis/rest/services/Sentinel2_10m_LandCover/ImageServer"        in_rst_landcover = "in_rst_landcover"        arcpy.MakeRasterLayer_management(in_raster=esri_lulc, out_rasterlayer=in_rst_landcover, envelope=in_fl_extent                                         )        der_rst_step1a = "step1a.tif"        arcpy.management.Clip(in_raster=in_rst_landcover, rectangle="", out_raster=der_rst_step1a, in_template_dataset=in_fl_extent, nodata_value='', clipping_geometry="ClippingGeometry", maintain_clipping_extent="NO_MAINTAIN_EXTENT")

1 Comment
2024/04/18
13:07 UTC

1

Advice on fully automating some analysis

We have a regular piece of site screening analysis we do which is partially automated currently

For the GIS analysis side of things, I have a modelbuilder which I run in ArcGIS Pro. That runs a bunch of GP tools (clip, dissolve, calculate field etc), then appends some data to a few different web layers in ArcGIS Online. It also exports all the attribute data to excel.

The rest of the (more commercial) analysis is done in excel. I have a vba script which creates a new version of a blank spreadsheet created by my colleague and inputs the attribute data from the GIS exports. Excel then does a bunch of calculations which are based around commercial viability.

I've got a vision of a fully automated system that removes any need for excel. I'd need for non arcgis pro users to be able to update parameters relating to things like costing used in the analysis. They could be taught to use arcgis online. Ideally I'd also like someone who is not me to be able to press run on this (therefore ideally doesn't involve interfacing directly with pro).

I'm envisaging some kind of system in ArcGIS Online which uses a python notebook and references a bunch of layers/tables in ArcGIS Online? Or do you think it could be run remotely in pro to avoid needing to use credits? In either of those scenarios, how would I let users update the parameters? The 'input' to the model is a polygon feature and I'm really unsure how that will work without pro. Often we are sent a shapefile, sometimes I draw it from a PDF.

Keen to hear anyone's thoughts on this/if anyone has done any similar automation work or even if anyone has any blogs or videos they would recommend on this topic.

4 Comments
2024/04/18
12:38 UTC

3

Best method to create labels for road names in ArcGIS Pro?

For a series of maps I'm making, I need the roads to have their names displayed. However, the labels included with the default basemaps in Pro don't really work for my purposes (they don't stand out enough and not every road is labeled at certain scales). I think the label tool in Pro is likely my best bet, but I don't know how to modify the labels from the default settings; so I was hoping might be able to provide some assistance with it or an alternative.

5 Comments
2024/04/18
12:14 UTC

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