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1500 questions
24
votes
1 answer

Passing Filter Parameters to GeoServer WFS via URL?

I'm trying to use PHP's CURL function to fetch geoJSON information from a GeoServer instance. I'm doing this using url variables rather than trying to construct a full xml GetFeature request. However, I would like to be able to get a subset of the…
Ambulare
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24
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4 answers

Creating buffer in meters

Objective Given a list of coordinates in longitude/latitude, stored as a .csv file, I want to create a buffer with distance of x km around those coordinates. (In case this is relevant, these coordinates are locations of the societies in the SCCS…
Herr K.
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23
votes
6 answers

Comparing Google Earth Enterprise to ArcGIS for Server and GeoServer?

I'm working on a web app that includes mapping capabilities (currently just markers and KML overlays on an embedded Google Map). We're starting to outgrow the limitations of Google's free stuff, and Google Earth Enterprise initially seemed to be the…
Herb Caudill
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23
votes
3 answers

Mapnik, Mapserver or Geoserver

I'm currently developing an ArcGIS based flex web viewer. ArcGIS is great for most of the things but there are some issues like performance and license costs. That's why I'm looking into possible alternatives. At the moment I've found 3 possible…
tmske
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23
votes
12 answers

Which tools and methods can be used to create isochrones?

I'd like to get an idea for what's involved in creating isochrones for a series of sites, with a reasonable degree of accuracy to the estimates. A general outline would be great, though my scenario would be for sites in London as I guess the…
euki
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23
votes
2 answers

Understanding ESRI's .asc file

Reading the ArcGIS help: Supported raster dataset file formats, I read that ASCII Grid file types are addressed with the singular file extension .asc for both 16 bit signed-integer (for discrete data) and 32 bit floating-point files (for continuous…
Andre Silva
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23
votes
5 answers

Writing automated tests for QGIS plugins

I'm looking for advice on writing automatic tests for QGIS plugins written in Python. I have written tests for Python scripts in the past using PyUnit (the unittest module), but have never done so for an application with a GUI. I've found a page…
Snorfalorpagus
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23
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2 answers

Which geodatabase type is most appropriate for both open source and ESRI use?

Main Question: Is there a geodatabase type that seamlessly works with both ESRI and open source products? Details: My company currently passes around geodata in various vector and raster file formats and isn't particularly organized. Most…
Ethan H
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23
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9 answers

Seeking Symbology for Interactive Mapping?

When a user clicks on a map what should they expect to see? I would say a symbol for where they clicked. A pushpin seems to be the most accepted icon for generic data. Google has pushed the upside down tear drop. What are other ideas/options and…
Steve
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23
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1 answer

Getting coordinate system name from SpatialReference using GDAL/Python

In Python, using GDAL, I've extracted a raster's projection as a WKT string as follows: wkt = dataset.GetProjection() # wkt is…
hendra
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23
votes
4 answers

Seeking Country/State/City Database

I am creating a directory which uses locations to categorize all listings. Instead of relying on user input, I'd like to provide a list of locations which the user can select. I have already tried GeoWorldMap which is provided by GeoBytes but it has…
Naif Amoodi
23
votes
1 answer

How to rename field names in a shapefile from the commandline?

I need to rename the field names (attributes) in a shapefile. Is there an easy way to do this from the command line?
rudivonstaden
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23
votes
3 answers

Merging/collapsing nearby and parallel road lines (eg. a dual-carriageway) into one single line

I have a shapefile from OSM which contains all the roads within a city. Larger roads (like dual-carriageways) seem to have 2 parallel lines. I'd like to collapse / combine those into 1 line so I can export and render them nicely in an external 3D…
Robin Hawkes
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23
votes
3 answers

Geometry column naming convention - 'geom' or 'the_geom'?

I'm starting my first PostGIS project, and in various books and tutorials I've seen the geometry column labelled either 'geom' or 'the_geom'. Is one more conventional than the other? Furthermore, is there a good reason to use 'geom'/'the_geom'…
Nick
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23
votes
1 answer

Where can I find the WKT standard or reference?

I had a little confusion about the representation of a geometry as well-known-text (WKT). I was searching for the WKT Specs to search for the exact representation, but I did not find the Standard. Is there a standards document or reference for WKT?…
Devdatta Tengshe
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