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1500 questions
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8 answers

Installing GDAL and OGR for Python?

I am developing some code in Python, and I want to use the GDAL/OGR python bindings. What is the minimum I need to install in order to use the GDAL and OGR python bindings? What is the easiest way to install GDAL/OGR if I only want to use it from…
BenjaminGolder
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5 answers

Creating TFW and PRJ files for folder of GeoTIFF files?

I have a folder which contains a large number of files in GeoTIFF format. I need to generate both PRJ and TFW files for each of these images. Is there some way to do this?
Joe
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18
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2 answers

Convert .tif with .tfw to a GeoTiff?

I have a tif image file, and a .tfw world file (created from OSM data with Mapertive). How can I (using linux command line) convert that to a GeoTIFF file? (i.e. I want to have one file, not 2). I'm sure it's possible with gdal or something.
Amandasaurus
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5 answers

Difference between Vincenty and great-circle distance calculations?

Python's geopy package features two distance measurements techniques: Great Circle and Vincenty's formulae. >>> from geopy.distance import great_circle >>> from geopy.distance import vincenty >>> p1 = (31.8300167,35.0662833) # (lat, lon) -…
Adam Matan
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18
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2 answers

Reprojecting WGS 1984 Web Mercator (EPSG:3857) in Python with GDAL

I am reprojecting rasters in python using GDAL. I need to project several tiffs from geographic WGS 84 coordinates to WGS 1984 Web Mercator (Auxiliary Sphere), in order to use them later in Openlayers together with OpenStreetMap and maybe Google…
nadya
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18
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2 answers

Multiple labels for one layer in QGIS

Is it possible to show two or more labels for one layer? For example - one label will show the name of a school and the 2nd label will show the number of students? They should be completely different labels. Editing one label (its buffer, font,…
H.Wiener
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4 answers

What is a good resource for learning to hand draw a map?

I've been wanting to go old school & draw some maps by hand... Something like you might see on the first page of an adventure novel. I've found next to nothing on the web and am hoping that one of you has (or has seen) an ancient cartography text…
BrianPeasley
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GUI tools for PostgreSQL/PostGIS?

as a cartographer I work with TileMill to visualize geodata. I installed a local PostgreSQL server with PostGIS and osm2pgsql. Everything works fine. Anyhow, I am new to working with servers and the command line approach. So, in learning the basics…
jm60
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18
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8 answers

Examples of building-level geovisualization

I have recently stumbled upon a presentation and paper by Duncan Smith exploring geovisualization of 2001 area classification of output areas using building level resolution of urban area (London in this example). Two questions: Could you point…
radek
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1 answer

Will ArcGIS Pro have (better) ModelBuilder?

An earlier Q&A (What are Esri's new "ArcGIS for Professionals" and "ArcGIS Pro"?) provided some reassurance that ArcPy code would have re-use value with ArcGIS Pro: ArcGIS Professional Extensibility. Here are our current thoughts about…
PolyGeo
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18
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3 answers

How to create an OD road distance matrix in QGIS?

I'm looking for the steps required to produce an origin-destination (OD) cost matrix. What I'm looking for is a matrix of road distances. The distance matrix tool only produces euclidian distances. The QGIS Roadgraph plugin produces the shortest…
Mathieu Philibert
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18
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2 answers

Is it possible to create Thiessen polygons around nodes in QGIS?

Is it possible to create Thiessen polygons around nodes in QGIS? e.g. http://en.wikipedia.org/wiki/Voronoi_diagram
Robertg
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18
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4 answers

Implementing ringmaps in ArcMap

In a recent article by Stewart and colleagues in IJHG I stumbled upon interesting technique of visualizing data using ringmaps. Some more information referenced in the article about this technique here and here. [Source] From the…
radek
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What GIS analysis techniques were used in determining Gale Crater as the landing site for the Curiosity Rover?

What specific GIS analysis was used in determining Gale Crater as the landing site for the Curiosity Rover? I'm assuming factors such as slope, elevation, ruggedness, etc were used as well as potential for finding water (what determines this). I'm…
Fezter
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Seeking software for making digital elevation models from UAV aerial imagery

I have an unmanned aerial vehicle (UAV, also called a drone) and would like to use it to create a digital elevation model and orthomosaic over a smaller area (10 km2). My platform will be able to produce overlapping imagery with an altitude of…
ragnvald
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