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Community Moderator for Geographic Information Systems SE

Moderator Pro Tem for Genealogy & Family History SE.

Freelance ArcGIS Specialist & GISP-AP with 25+ years Esri software experience, working where possible with Geoprocessing (including GP Services), ArcPy/Python, Open Source GIS, OGC Interoperability, OpenStreetMap, Zoology & Genealogy.

Author of:

  • ArcGIS for Desktop and Google Earth eLearning videos which are available via Discover Spatial
  • Introductory to Advanced level ArcGIS for Desktop and ArcPy training courses which are available Instructor-led or Self-paced - see PolyGeo website

Available for commercial ArcGIS consulting, training and support assignments, and willing to provide quotations to tackle any intractable ArcGIS for Desktop and ArcPy problems which appear on GIS Stack Exchange when they may be unsuitable to resolving expediently using its focussed Question & Answer format.

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Oct
14
comment Converting Feature coordinates to text (same as output from UNGENERATE command in ArcInfo Workstation)?
@Singh If you are interested in the outcome of this Q&A then you should Favorite it by clicking the icon beneath the up/down vote counter next to the question.
Oct
14
comment Converting Feature coordinates to text (same as output from UNGENERATE command in ArcInfo Workstation)?
If you are trying to create the same output as Arc: UNGENERATE, then did you try the suggestion at gis.stackexchange.com/a/7344/115 ?
Oct
13
comment Best practice to perform raster map algebra in open source web GIS?
@JohnBarça the extension suggested is to ArcGIS for Server and so is used in a web context.
Oct
13
comment Using Detect Feature Changes Tool in ArcGIS for Desktop?
Welcome to GIS SE! As it stands I think your question is too broad and risks being closed. Rather than saying effectively "I'm about to use tool X, and I am after anything you know about it before I do", I recommend reading the tool documentation several times, as you experiment with what it can do that helps you, and if you are then stuck to edit your question to ask a more focussed question about that.
Oct
13
comment Adding data from PostgreSQL to Query Layer of ArcGIS for Desktop warns that given coordinate references are incompatible?
Would you be able to also include the version of ArcGIS for Desktop that you are using and exact example values that you are feeding into the Query Layer when it works and when it does not, please?
Oct
13
comment How can i convert .tif file into headerless (flat) binary files?
@nilushika This looks like a new question that I recommend you research/ask separately.
Oct
12
comment What is the difference between `Area_2D`, `Area_3D`, and `Volume` in surface volume calculation?
You seem to be asking a near identical question for the third time. If there is an aspect that remains unanswered then I recommend that you edit this question to focus on just that aspect.
Oct
12
comment Error 000212 Cannot create XY event source from arcpy.MakeXYEventLayer_management?
This looks like it could be a duplicate of gis.stackexchange.com/questions/10225/… - if it turns out to be the same error message from a new cause I think we should consider merging the two Q&As.
Oct
12
comment Clip Management won't work outside of ArcMap/Catalog
When I see ERROR 999999 my first suspicion is always whether I have enough RAM available for what I am trying to do. If you are in a position to try the same code and data with much more RAM to see if it "just works" then that may save you a lot of futile debugging. If such a test is not easy then try using fewer, smaller datasets to as a test of your code logic.
Oct
12
comment Validating whether PDF file Uploaded as part of Geoprocessing Service of ArcGIS for Server?
Would you be able to include a code snippet from your code so far, that works up to the point where you are stuck, please? The answer seems easy - just use arcpy.Exists() to test whether the PDF has been uploaded if you know its name, if it does then append it, if not then pass. If you just want to test whether any PDF file has been uploaded then use arcpy.ListFiles() to look for *.pdf files in the folder you have them uploaded to.
Oct
11
comment What should be used for website building for displaying raster data?
Would you be able to review the answers to the question that I have made this a duplicate of, please? If you then think there is a unique requirement that you have which none of the options there cover, then if you edit your question to provide more details about what you have tried and where you are stuck then that is where our users may be able to assist.
Oct
11
comment Web mapping application with time slider and raster data
This may be a related Q&A: gis.stackexchange.com/questions/18760/…
Oct
11
comment Regional Large Scale Map Projection Choice
Something similar has been asked at gis.stackexchange.com/questions/104005/…
Oct
10
comment Where to find QGIS tutorials and web resources?
Both links here seem to be broken.
Oct
10
comment Clip Management won't work outside of ArcMap/Catalog
What happens when you just hardwire all the Clip parameters into a two line test script (with import arcpy as first line). I would be keen to see the IDLE banner and error message, and the exact Python code, if this falls over.
Oct
10
comment Alternative map solutions for a web application behind a paywall (paid webapp)
If you do not think this is a duplicate of gis.stackexchange.com/questions/8113/how-to-start-web-mapping then can you be sure to review that Q&A and heavily revise your question to focus it on what you see as being the key requirement that is not addressed there, please?
Oct
9
comment Is Natural Earth (the site) dying?
Although it took almost 15 mins I was able to download the Natural Earth quick start kit without a problem just now. I too am keen to know the longevity of this great service.
Oct
8
comment Unable to plot values for individual fields in my table using ArcGIS for Desktop?
I think you should do this one problem/question at a time. It sounds like your first problem/question is "unable to plot the values for the individual fields in my table". I recommend that you edit your question to remove details that are related to the other problems/questions and focus this question on just that problem. The others can then be researched/asked separately. Can you describe what you mean by "plot the values for the individual fields" in more detail? Are you meaning that you cannot apply a categorization on those values on the Symbology tab of the Layer Properties?
Oct
7
comment Similarity between two or more trajectories
You have tags for postgis and postgresql but do not mention either in your question body. While tagging is important, if you are using those products, I strongly recommend recording them in the body of your question because, after glancing at the title, this will be the section of your question that gets all the attention.
Oct
7
comment Viewshed for each pixel in raster?
Welcome to GIS SE! Would you be able to edit your question to include the GIS software, extension and version that you are using, please? Also, you will find that you are much more likely to get help with where you are stuck on code if you can post a snippet that works up to that point.