GIS Stack Exchange
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1500 questions
22
votes
7 answers

Are there any Indoor GIS platforms?

What sort of infrastructure is needed to allow me to write a simple mobile app for indoor navigation? Professor Mike Goodchild said: the average American only spends 13 percent of the time outdoors. GIS-based services help us find …
Kirk Kuykendall
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22
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4 answers

Exporting shapefile to PostGIS database in QGIS

How do I export a vector shapefile to PostGIS database? I am asking what format I have to export it.
Arun
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22
votes
7 answers

Choosing GeoCoding service?

I'm looking for a web service providing a full address based on coordinates (and reverse). I'm ready to pay for that service. I don't want to use Google's API.
Pierre 303
22
votes
2 answers

How does Watson solve Geography problems?

In spite of losing to humans on the geography question, Watson still won Jeopardy. The explanations regarding this incorrect answer seem a bit lame to me (at 3:40 in the video). With a logo like this, I would expect Watson to perform better at…
Kirk Kuykendall
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22
votes
4 answers

Can Mapbox Vector Tiles be used as QGIS basemap?

With the implementation of the mapbox vector tiles begs the question of how these could be used as a basemap in a QGIS printed map (assuming anyone cares about printed maps anymore!). To use OSM data in a high-quality printed map currently involves…
DPSSpatial_BoycottingGISSE
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22
votes
4 answers

Custom Leaflet Controls

I have gotton some help in creating a custom control for leaflet, but I am still having trouble upgrading to the CSS styles used by the latest versions of Leaflet. Basically, all I need is a icon in the white box, with the drop shadow around…
Dr.YSG
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22
votes
5 answers

Selecting contours which heights are integers?

I have a Contours Featureclass, with an interval of 0.2 meters. I wish to select only those Contours, which are at 1 m interval? I have tried using the following syntax in the 'Select by Attribute' dialog (in ArcMap), but it selects all the…
Devdatta Tengshe
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22
votes
7 answers

Securing WMS against unauthorized access?

In a project the customer wants the images of the WMS to be secured against unauthorized access. What are the common solutions to realize that? Are they compatible with the OGC-standards?
Mnementh
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22
votes
6 answers

Finding boundary co-ordinates from given set of point co-ordinates?

Given a set of coordinates, How do we find the boundary coordinates. <== Figure 1 Given the coordinates in the above set, How can I get the coordinates on the red boundary. Boundary is the polygon which is formed by the input coordinates for…
Khaja Minhajuddin
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22
votes
7 answers

How to cut a 'tiled image' from a raster dataset using GDAL?

I am working on an app that needs to create tiles (jpeg) from a given raster dataset. My initial inclination was to use gdal2tiles.py, but its performance seems like it could be improved. That leads me to ask the following question: What would be…
user890
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22
votes
2 answers

Adding shapefile or feature class as layer in ArcMap using ArcPy

I am trying to automate various tasks in ArcGIS Desktop (using ArcMap generally) with Python, and I keep needing a way to add a shapefile to the current map. (And then do stuff to it, but that's another story). The best I can do so far is to add a…
Tom W
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22
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5 answers

Learning Spatial Statistics?

I have a significant background in statistics, and I'd like to learn more about spatial statistics (and statistics associated with geospatial data). Are there any especially good resources for someone looking for an overview of the field? I am not…
DanB
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22
votes
4 answers

What to do with -3.4e+38 nodata values?

I am trying to process some bioclimatic raster files, such as can be downloaded from http://www.worldclim.org/current (bioclim set). They seem to have nodata values set to -3.4e+38 according to QGIS (looking at the output of gdalinfo, it's…
rudivonstaden
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22
votes
3 answers

Performing Raster Noise Reduction and Edge Smoothing?

I have a raster image like this I want to delete the isolated noise point and smooth the edge (say the white single points, and I want the edges of the entity look smooth). How can I do this in ArcGIS or in R? The cell size is 30*30.
Seen
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22
votes
2 answers

Using R to calculate the area of multiple polygons on a map that intersect with another overlaid polygon

I have a shapefile downloaded from the Ordnance Survey that gives electoral ward (division) boundaries for a county of the United Kingdom. I have successfully used R to load the shapefile and plotted various maps using ggplot2 as described in this…
SlowLearner
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