RyanKDalton
  • Member for 11 years, 3 months
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Selecting features with NULL attributes in QGIS
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64 votes

Have you tried replacing the "=" with "is"? I don't have QGIS in front of me, but that is pretty common database select syntax for working with NULL values. pedonal is NULL

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How to Start Web Mapping?
37 votes

I also just attended a conference where they presented the OpenGeo Suite, which is a stack of OpenLayers, GeoServer, GeoExt & PostGIS. They offer both the "Enterprise Edition" (paid for version ...

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Seeking comprehensive list of latitude and longitude values for cities around world?
33 votes

Don't forget about Geonames dataset: The GeoNames geographical database covers all countries and contains over eight million placenames that are available for download free of charge.

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Alternatives to using Arcpy
31 votes

You will find a number of other similar questions on this site that ask the same basic question and have very good references. The most similar (and detailed) is: What are the Python tools/modules/...

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Defining projections for multiple shapefiles in ArcMap?
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29 votes

I think you guys are overthinking this one... Right-click on the "Define Projection" tool in toolbox, select "Batch", drag-and-drop your layers into the "Input Dataset" column, right-click in the ...

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Ways to Speed Up Python Scripts Running As ArcGIS Tools
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26 votes

A couple potential suggestions to help speed up your process are: Select Layer By Attribute can be in a Python-only script, without ever launching ArcGIS Desktop. You need to convert your "buff" ...

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When to use ModelBuilder over Python scripting and vice versa?
25 votes

If you are working solely within the confines of ArcGIS, there are a few considerations I would consider when attempting to determine the approach to take. What are you trying to accomplish, What ...

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Joining tables without losing original field names in ArcGIS for Desktop?
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23 votes

I think what you might be trying to do is NOT use "fully qualified table names". To do so, in Environment Settings -> General Setting, uncheck "Maintain fully qualified name". Take a look at ...

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Copy single feature into another feature class
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20 votes

Have you tried simply copying and pasting features? You can do this by adding both shapefiles to the map TOC, then choose "Editing-> Start Editing", and choose the DESTINATION shapefile workspace to ...

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Select By Atribute using python script on .Shp file getting error 000840 value is not raster layer
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19 votes

This is a common error that I have run across, and I am pretty sure it is related to attempting to run the selection against a raw featureclass/shapefile output, as opposed to the "layer" ...

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How to convert field values from lower case to upper case in ArcGIS 10.1?
18 votes

Another alternative using Python would be: !fieldname!.upper() as described in the online help Calculate Field examples.

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Why learn/use Python Toolboxes over Python Script Tools?
16 votes

The help section titled Comparing custom and Python toolboxes has a pretty good comparison of why you might choose one over the other, although I'd be curious to hear "real world" advantages/...

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Adding hyphen in ArcGIS Field Calculator to merge two columns?
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15 votes

You will want to concatenate the two fields together. To do this in ArcMap you can use the VB Script function "&". So using your example, the calculation would be [FROM] & "-" & [TO] ...

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Finding GIS data sources for developing nations?
13 votes

I think you will find that the Natural Earth dataset and OpenStreetMap will give you a good start for worldwide base data, in addition to simply searching for questions with the data tag here on our ...

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How to create an extent indicator in QGIS 1.8 print composer?
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12 votes

I think what you are looking for is called the "Overview Map". The YouTube video called "Tutorial 21 - Adding a Locus/Overview Map to a QGIS Print Composer" shows how to add an overview map using ...

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Automated/geoprocesing tool to slice, clip, or cut polygons using polylines using ArcGIS Desktop?
12 votes

I thought there must be a way to do this, so I created my what I believe to be a pretty good solution. I have posted it on the ArcGIS Resources site and in the Community->Technical->Analysis & ...

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How to create an "area of interest" polygon mask?
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12 votes

Thank you @underdark for your direction to this solution. The fTools function "Difference" was exactly the tool that accomplished the task. However, different from your suggestion, I did not have to ...

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Which software to use to create professional fly-over/ fly-through animations?
11 votes

I have created a couple of ArcGlobe videos in the past (~4yrs ago) that look to have about the same video quality as the NPS video you referenced. The key that I was told (and found to be true) was ...

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Is there maximum number of .DBFs that can be joined using ModelBuilder?
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11 votes

This isn't an issue with ArcGIS, but rather a limitation of the DBF fille format. DBF files have a maximum of 255 fields. See: Maximum number of rows and columns can a DBF file contain

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Converting Visio diagram to GIS layer for ArcGIS Desktop?
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11 votes

After doing a few tests, I came up with a solution that seems to work pretty well. I was fortunate that the Visio user put all of the objects in "Visio layers", so I could use a Definition Query to ...

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Finding differences between shapefiles using ArcGIS for Desktop?
Accepted answer
11 votes

With the Compare Feature Tool, you should just choose your Segment_ID field as the sort field in the dialog. The [sort] field or fields [are] used to sort records in the Input Base Table and the ...

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Generating Tiles with QGIS?
11 votes

I recently came across a new plugin for QGIS 1.9 called QTiles. It's development was announced Dec 2012 on the QGIS Developer forum. QTiles designed to generate raster tiles from QGIS projects ...

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Are there any Indoor GIS platforms?
10 votes

Update 5/24/2016 Google's Project Tango has "Area Learning". Google Maps just announced that they are now "mapping the indoors". From Wired.com: "Google Maps 6.0 for Android launched Tuesday with ...

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How does one replace characters in a layer name using Python ("_" with " ")?
10 votes

It's pretty much the same code as what you have, but you just need to incorporate the Python "replace" method. By checking for the existence of the underscore in original name you can avoid ...

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Mapping matrix of origins and destinations in QGIS?
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10 votes

If you are just looking to connect orgin/destination points and not needing the curved "great circle" lines, take a look at the QGIS plugin called "mmqgis". It has a Hub Lines tool that I think will ...

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How can I import georeferenced photos (jpg, kml, kmz) using QGIS or ArcGIS for Desktop?
10 votes

QGIS has a plugin called "Photo2Shape" that will convert the geotagged coordinates of the photo into a shapefile. You can then use the "eVis" plugin to set up hotlinks to the photos themselves, and ...

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Removing small spaces (slivers) between polygons?
10 votes

ArcGIS has topology rules that will help you identify and correct gaps in your data such as what you are referring to. In order to create Topology Rules you will need either an ArcEditor or ArcInfo ...

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Accounting for Colour Blindness when designing maps?
10 votes

Gretchen Peterson has written a few books/booklets on GIS cartography that could be useful resources. GIS Cartography: A Guide to Effective Map Design Making and Using the Colors For Maps Booklet - ...

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Basic PostGIS and PGRouting question
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10 votes

I was in the same boat as you just a couple of weeks ago and was able to get a shortest path with relative ease by using the tools/information below: As previously mentioned, I use pgAdminIII as my ...

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Python script to export .csv tables from GDB
9 votes

ArcGIS already has a tool to do this called "Export Feature Attributes to ASCII" which is in the Spatial Statistics--> Utilities toolbox. The advantage of this tool over "Table to Table" is that ...

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