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1500 questions
23
votes
1 answer
Clustering of multiple raster layers to create sub-regions using QGIS?
I'm attempting to create n sub-regions from a polygon based on a cluster analysis of a bunch of overlapping raster layers (physical layers, eg: depth, currents, waves).
Currently, I can create a regular grid across the polygon, then extract physical…
Seagus
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23
votes
3 answers
Adding new group layer with ArcPy?
Does anyone now how to add a group layer with Python in ArcGIS Desktop 10?
I can use arcpy.mapping.AddLayer but surely this is only for an actual layer as opposed to a group layer.
so far I have this
import arcpy
mxd =…
Ian Torr
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23
votes
5 answers
Using schema other than public in PostGIS?
I'm currently setting up a fresh install of PostGIS 2.0.2 and PostgreSQL 9.1.6 on Ubuntu. I've recently come across some information indicating that using the public schema to store all data is not a good idea.
For this reason, I've set up a schema…
Paul
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23
votes
1 answer
Space filling between random 2D lines
Consider a region (2D) filled with lines randomly (following Figure). We are interested in filling the empty spaces between lines including four boundary edges in a way:
0- maximizing the size of parcels;
1- shape of filling parcels is square…
Developer
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23
votes
1 answer
Converting SLD to Esri layer or lyr file
Is there a software/extension to convert an SLD to Esri. lyr format, or to import the SLD directly?
giohappy
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23
votes
3 answers
Arcpy Parallel Processing Environment
I recently discovered the Parallel Processing environment setting in ArcGIS (this must be new to 10.1), however, there is no mention as to what tools are designed to utilize this environment setting. ESRI provides one example of how to set the…
Aaron
- 51,658
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- 154
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23
votes
8 answers
Modifying single Pixel values in QGIS?
I would like to modify a raster (pixel values) in QGIS.
The plugins "value tools" can easily provide me with the value of the pixel of my raster.
However I don't know how to modify it.
I have found the Q&A titled Manually correcting raster DEM…
Renaud
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23
votes
2 answers
Generating rectangle centered by point in QGIS
I have a layer which contains points. The layer has "height" and "width" attributes.
I need rectangles around those points, but a point should be in the center of the related rectangle whose height and width value comes from the point attributes.
Is…
Lilium
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23
votes
4 answers
Would PostGIS offer an advantage over MySQL for a produce farm application?
I have a web app that stores the locations of farms in West Michigan. You can search for a product (e.g. "broccoli") and it will show you all the farms that grow that product.
Right now I'm using MySQL and using trigonometry to calculate the…
Jason Swett
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- 9
23
votes
3 answers
Extrapolating a line in PostGIS
I'm trying to extrapolate from a line segment to find a point on the line but a 3rd of the way 'back', i.e. trying to find point new, given points A and B below:
Given a line, I can interpolate it to get a position at any particular percentage…
EoghanM
- 539
- 3
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23
votes
3 answers
Accessing raster attribute table in QGIS?
I have some Python code that makes Raster Attribute Tables for GeoTiffs using GDAL.
In ArcGIS I can see these attribute tables fine and they behave how I like (as classifications) but in QGIS the whole concept of an attribute table seems to be…
Rich
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23
votes
4 answers
Proper way to rbind SpatialPolygonsDataFrames with identical polygon IDs?
What's the proper R idiom for rbinding SPDFs together when the IDs overlap? Note that here (as is often the case) the IDs are basically meaningless so it's pretty annoying that I can't just make rbind ignore…
Ari B. Friedman
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23
votes
5 answers
GIS developer blogs ... recommendations?
I'm looking for recommendations for GIS blogs ... specifically GIS developer blogs. I'm less interested in the geography than in how apps are put together.
I'd like to keep up with ESRI ArcGIS as well as open source tools.
Which blogs are you fine…
user9795
- 61
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23
votes
5 answers
How to produce a better inset map in ArcMap?
Attached is an example of a generic inset map designed in ArcMap 10. For all the wonderful things that this software can accomplish, there has to be a more sophisticated way to produce better looking inset maps than my default method.
I would…
Aaron
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- 154
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23
votes
3 answers
How to Find the Average Raster Value of an area defined by a shapefile using R?
I have a set of raster images which represent a specific month over the years, and I want to make a timeline of the average values of an area using a shapefile.
How do I extract the values from the rasters and import them in R in a manner that I can…
nickves
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