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1500 questions
23
votes
2 answers

QGIS Filtering Multiple Values using Query Builder

In the "Query Builder" I can currently filter on value from the "Values List", but I'd like to be able to filter for multiple values at once. How can I go about doing this using the SQL and "Operator's Section"?
DCourt
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23
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5 answers

ArcMap.exe processes stay open after closing ArcMap?

I realized that this is happening months ago when I was not able to alter table structure in an instance of ArcMap after another instance was closed. When, for example, I remove or add some fields to a feature class in ArcMap, save and close the…
Jakub Sisak GeoGraphics
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23
votes
1 answer

Transformation types in geo-referencing of QGIS?

I am a beginner in geomatics. I am trying to georeference some images in QGIS. I would like to understand what is happening behind the different transformation types (linear, polynomial, Helmert...). What I don't understand is the red lines that…
Manimalis
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23
votes
6 answers

Creating Layer in GeoServer using REST

As part of a possible solution to GeoServer WFS Row Level Security? I want create a layer in GeoServer via REST that supplies a SQL statement along with a userid. I think i would create a feature type and publish it. I need to do this all in…
CaptDragon
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23
votes
3 answers

Are there any OpenSource ArcObjects Projects?

One of the major benefits of developing GIS applications based on opensource libraries, is that many projects spring up on top of them which are also opensource. Well designed opensource projects are great for seeing: which coding patterns should…
geographika
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22
votes
1 answer

Elevation color ramps for DEMs in QGIS

I need to color a DEM that I have loaded in QGIS 2.2. I'd like the DEM colors to represent different elevations. None of the color ramps that come with QGIS are related to elevation, so can anyone point me to pre-existing ramps that I can load in…
Stu Smith
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22
votes
2 answers

Dissolve/aggregate polygons with ogr2ogr or gpc?

I have a large number of polygons representing the boundaries of US counties which I need to merge into as few polygons as possible. Is it possible to do this with non-commercial software, or software of a reasonable price? I have been thinking of…
Lee Goddard
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22
votes
1 answer

Using customized Coordinate System in ArcGIS Desktop?

I don't know so much about coordinate systems... In my office we use to deal with spatial data coming from archaeological sites. Each site has its own x-y-z coordinate system (GCS). Three simple ortogonal cartesian axis. In the last years we have…
Maik
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22
votes
2 answers

How to extract pixel value counts from a raster in QGIS?

How does one go about obtaining a summary of the counts of cell values within a raster in QGIS? I know QGIS is doing this, in order to provide the summary statistics and histogram in the properties of the layer. I do not need the summary statistics…
Loren
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22
votes
4 answers

GIS Related Information Governance

I often work on mapping sensitive patient level data. Whilst I feel I have a good grasp of many of the governance issues around this (ie when to use binning and k-anonymity techniques) but I'd like to improve my knowledge on this. Here is a good…
Tumbledown
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22
votes
9 answers

Changing Field Name in ArcGIS Desktop

How can I change the field names (not the alias) in ArcGIS 10.2? I already found this page on ArcGIS support: "Renaming shapefile fields (Defense Mapping)" but there is is not "Defense Mapping" on Customized Mode Categories In my ArcCatalog! Without…
user1106951
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22
votes
10 answers

Seeking GIS data for fast food industry?

I am working a small project related to fast food industry. I am trying find GIS data for fast food chains like subway, MC Donald's, Arby's, etc in state of Ohio. Basically, I am looking for point location of each facility (for each fast food…
Raj
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22
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1 answer

How to change the field value of a Shapefile using GDAL/OGR?

I am trying to change the field value of a shapefile. However it doesn't change the value. What's wrong with my code? import ogr driver = ogr.GetDriverByName('ESRI Shapefile') fn = 'dist.shp' dataSource = driver.Open(fn, 0) layer =…
ustroetz
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22
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5 answers

A SQL console in QGIS

I know QGIS comes with its field calculator, which is not bad. It also comes with ftools which permits several operations on geometry and attributes. But we often need more control and I haven't seen any convenient tool in QGIS to perform such…
simo
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22
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8 answers

Pure JavaScript Library for Geometry Operations

Does anyone know of a pure JavaScript library for doing geometry operations such as buffer, union, intersects, etc? I want to play with doing these operations in the browser. It looks like GeoScriptJS has some dependencies.
atogle
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