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1500 questions
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16 answers

Seeking ArcGIS Desktop Tips and Tricks

A couple times a month, I check out the various tips and tricks CW posts on Stack Overflow and always learn something new. I went back and forth as to whether to pin this question to a specific program of a specific, major version of GIS software. …
Jay Cummins
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How does what3words build a grid of squares on the surface of the Earth?

What3words built a grid of squares of 3m2 on the earth. Does anyone know what is the algorithm ? I started with this method: the range of longitude is [-180, 180] and the range of latitude is [-90,90]. If you cut them into equal intervals, you can…
John Smith
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Select distinct values from a single column of an attribute table (or layer)

Is there a way to select distinct values from a column in ArcMap? I have the data in both GDB and SHP formats. I have searched for ways to select using SQL, QueryLayers, ModelBuilder and individual toolboxes and it appears as all selection options…
Steve
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How to check if a leaflet layer is already added on the map?

I built a simple map app where I have a layer on top of a map. In Leaflet, how can I check if the layer is already present?
user1919
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5 answers

Adding simple WFS layer from GeoServer to OpenLayers map

I'm trying to add one of the included datasets with GeoServer to an OpenLayers map. I've followed the OpenGeo tutorials, seen similar thread on here, but I can't seem to crack it. Can you take a glance at my code and GeoServer setup and tell me…
geo_james
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3 answers

Loading a raster into a PostGIS 2.0 database on Windows

I'm trying to figure out how to load a raster into a PostGIS2.0 database (I have asked previous questions on this topic here and here). I am trying to use the raster2pgsql.exe program provided with PostGIS2.0. After figuring out that the command…
djq
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1 answer

Choosing coordinate system for mapping Mars in ArcGIS Desktop?

I wish to use ArcGIS Desktop to map planets, in particular Mars. Where would I start in terms of basemapping and projection?
user5495269
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1 answer

Performing QGIS modeler multiple raster calculations with data from external CSV?

I need to perform multiple calculations on a set of rasters based on values in a CSV metadata file. I'm using the QGIS graphical modeler and can call a specific field in a CSV with the Table and Table Field inputs. Since I have multiple rasters,…
HDunn
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5 answers

Standard SLDs for OpenStreetMaps?

We have downloaded OSM data for our region and loaded them into PostGIS using osm2pgsql. So far so good. On top we have GeoServer and we would like to expose the OSM data using WMS. We would as well like to style data like in "standard"…
user4944
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3 answers

Producing building shadows using ArcGIS Desktop?

How would you generate building shadows from building footprints? I have attribute values for the heights of buildings. So would preferably like to have the shadows' sizes vary based on that. The best suggestion I've found using ArcGIS is drop…
EightyTwenty
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4 answers

Using ArcPy to zoom to selected feature?

Is there a way to zoom to the extent of a selected feature using the ArcPy module in ArcGIS Desktop 10.
Zachary
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9 answers

How can I enable Shapefile GUI Loader in pgadmin3?

I have installed PostgreSQL 9.1 with PostGIS 1.5.3 on Ubuntu 11.10. I also installed pgadmin3 1.14.0-beta1, following this instructions. If I remember correctly, when I installed PostGIS on Windows pgadmin automagically came with Shapefile GUI…
radek
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1 answer

Add feature manually to a vector layer in ol3

I'm trying to add a layer manually to a vector layer with javascript. I can't seem to determine why this is failing: http://jsfiddle.net/Kieveli/f4t6n6v1/4/ I've tried sane coordinates like 16,22, and big ones to match the view's xy values. I get a…
Kieveli
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Algorithm to fix topological errors in GIS software apps

Related question here. I notice that ensuring topological correctness is essential for GIS applications, this is because the input from user or polygon boolean operation can have severe topological problems ( even though the polygons look correct)…
Graviton
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4 answers

Creating Isochrones in QGIS

In QGIS I have tried to create isochrones around points for quite some time. Is there any option to create isochrones on the GUI in QGIS? I know how to create them using pgAdmin (using e.g. @underdark's explanation and example…
groc
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