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1500 questions
29
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2 answers

Seeking qml or sld file for QGIS + OpenStreetMap data?

I'm looking for a qml file (or equivalent e.g. sld) to allow me to use QGIS to take OpenStreetMap data and produce paper maps. I'm re-asking this question (it was asked once or twice over a couple of years by other people) because I'm really…
Rostranimin
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29
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6 answers

Is there an opensource way of making 'streetview' panoramas?

I'm interested in making streetview panoramas and am curious if there are any opensource approaches that I should consider for both making and publishing these panoramas. I've been playing with the Android functionality on my phone to make Android…
djq
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29
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11 answers

Examples of GIS projects gone wrong?

I would like to know some examples of GIS projects that have gone wrong. i.e. Bad decisions would/were made, based upon the GIS output from that project. I am not looking at naming and shaming anyone, so if it is a company you have worked for,…
jakc
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29
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3 answers

Computing an averaged latitude and longitude coordinates

How can I compute the average between several latitude and longitude spots? Should I just compute the Arithmetic mean for both lat and lng?
aneuryzm
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29
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3 answers

Converting GeoJSON to Python objects?

New to the site, and to geoJSON, and to python. My goal is to read in a file with geoJSON data, and use it to generate shapes to be used in an application that is using python scripting. Python has the ability to read it in, and do some…
Mike Weber
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29
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4 answers

Resampling GeoTIFF images to same resolution using QGIS

I have two geotiff images that I would like to resample the same resolution. If I use ArcGIS Desktop this is easy to do but how do I do this using QGIS?
Gil Gonçalves
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29
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6 answers

What are differences between ArcGIS Web APIs (JavaScript/WPF/Silverlight/Flex)?

Esri currently offers 3 different web API's that can be freely downloaded. Are they all equal? If not, what are the relative strengths/weaknesses of each of these API's?
Kirk Kuykendall
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29
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5 answers

Merge intersecting polygons into one which are part of the same feature

I'm not a GIS professional so I hope I use the correct wording, at least I hope you understand my question. Let's say there are five polygons in the feature A. In the shapefile there are more features. In feature A two polygons from the five…
user19746
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29
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9 answers

Working with PostGIS data in R?

I work with R almost all the time, and now I am using it for doing spatial data mining. I have a PostGIS database with (obviously) GIS data. If I want to make statistical spatial analysis and plot maps is the better way to: export the tables as…
nanounanue
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29
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2 answers

Seeking QGIS equivalent of ArcGIS Erase tool?

Is there a QGIS equivalent of the Erase tool in ArcGIS Desktop? The Erase tool: Creates a feature class by overlaying the Input Features with the polygons of the Erase Features. Only those portions of the input features falling outside the…
Johan
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29
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3 answers

Why learn/use Python Toolboxes over Python Script Tools?

I've written a few Python Toolboxes (which are new at ArcGIS 10.1), but am yet to decide whether/when I should write them rather than Python Script Tools in a standard toolbox. I thought the Online Help might enlighten me when it prefaces some dot…
PolyGeo
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29
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9 answers

Is there any way I can use a Key-Value store for geospatial data?

I have used many relational databases in the past, but I have also read about all NoSQL databases, and the Key-Value stores looks interesting. When I store geometric object I mostly use five indexed columns ID, MIN_X, MAX_X, MIN_Y and MAX_Y (where X…
Jonas
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29
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5 answers

Converting image of map into vector format

What is the best way of converting a gif of a map into a vector format, such as a shapefile? The only relevant parts that I am interested in are the outline of the island so I realize some manual work will be necessary where it is shaded orange; is…
djq
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29
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3 answers

Dividing polygon into specific sizes using ArcGIS Desktop?

I have several thousand irregularly shaped polygons in a shapefile. I want to be able to split each polygon into three areas, and to specify what the size of those areas (they sum to the previous total area). It does not matter what the sub-polygon…
djq
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29
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6 answers

Defining projections for multiple shapefiles in ArcMap?

I have over 100 shape files that don't have .prj file and thus when I bring them into ArcMap 10 they show the coordinate system as unknown. I know all of the shape files coordinate system is GCS WGS 1984. I also know I can use the Define…
wilbev
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