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1500 questions
16
votes
4 answers

Updating file locations in QGIS projects?

I have about 30 different QGIS Project files for 30 different clients. Each is saved onto my computer and all their relevant vector and raster files are all saved locally. We are now in the process of moving office and upgrading our computers. As…
Ger
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3 answers

Automating preprocessing of LANDSAT data

I'm currently enrolled in a remote sensing course, using LANDSAT data. Part of my course is about standardizing the scenes based on radiance values. I assume that because this is such a tedious task, someone has already figured out a way to automate…
Jacques Tardie
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1 answer

Allowing for multiple lines in legend of ArcGIS Desktop?

How can I force the description text in my legend to occupy more than one line? This is basically the same question as Forcing long layer names to multiple lines based on specified legend width in ArcGIS Desktop?. However, I want to use…
Martin
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16
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6 answers

What free or open source cloud-based software is recommended by/for the GIS community?

Note: This question is intended to complement an earlier question on installed, desktop software. What GIS-related, or even non-GIS-specific, web- or cloud-based software/tools/services -- that are free -- do you find useful, whether for GIS…
Martin F
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16
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12 answers

Alternative cartographic software programs?

I am looking for an alternative software product for cartography other than ArcGIS and Adobe Illustrator. The graphic quality in ArcGIS outputs is substantially poor when compared to outputs in illustrator, yet illustrator is not a true…
user2392
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5 answers

Is there a name for deformation-based maps?

I have already seen maps using deformation to visualize information. For example, this map shows temporal distance between some French cities when traveling by train:…
jeremy-george
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16
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3 answers

Is it possible to convert regular JSON to GeoJSON?

I have JSON data I've exported from Openpaths.cc which contains lat and lon values. However, the data is not in GeoJSON format so can't be read by OGR2OGR. Could anyone point me in the right direction on how to convert my data to GeoJSON? I'd…
clhenrick
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16
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6 answers

Pure Python Library for Geometry Operations

Does anyone know of a pure Python (no C or Java dependencies) library for doing geometry operations such as buffer, union, intersects, etc? I'm looking for something that is Google AppEngine compatible.
atogle
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16
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4 answers

GIS in medical geography

I am interested in knowing about current trends in application of GIS for medical geography other than disease/epidemic mapping, heath atlas, availability of health infrastructure (hospitals, blood banks, primary health centers etc).
SRG
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16
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3 answers

Looking for a tool that will place the cursor to a specific x,y coordinate

I am a new user to Quantum GIS. I am looking for a tool/function that will allow a user to type in coordinates, and place the cursor on that exact position. This is for navigation in the field... Here is a bit of context... I need to provide a…
Marie Ducharme
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2 answers

GEOTIFF explanation of .aux xml and tfw world file

I want to know how raster images work, I have a set of geotiffs that has no aux, tfw or xml when I check the spatial information in arccatalog, they do have an projection. and they shows correctly. if the projection is embedded in the geotiff, why…
jonaktiv
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2 answers

Constructing a Voronoi diagram using a complicated travel time metric

I have in my possession four sets of shapefiles: 1. Locations (points), around 1000 2. Roads (lines), each road has a speed attribute 3. Terrain (polygons), each zone also has a speed attribute 4. Rivers (lines), each river has a crossing delay time…
Alexey
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16
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8 answers

Are there sources for more esoteric data than streets worldwide?

Related to this question. For example, things like: political world map (as polygons) cities of the world geolocated climate data (avg temp, humidity, rain, as polygons), earthquakes, hurricanes (as polylines hopefully with strength as z-axis…
Vinko Vrsalovic
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16
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2 answers

Loading shapefile to a specific table in postgis using ogr2ogr

I have already created a geometry table in postgis. I want to load several shapefiles into that table using ogr2ogr. But I didn't find the parameter which could specify that table. ogr2ogr -append -f "PostgreSQL" PG:"dbname=db and so on"…
Yu Guo
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16
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2 answers

Extracting values from rasters at location of points using R

My question is about extracting values from rasters at the location of points. With the function extract this is very easy, and the function gives me a dataframe with the values of all the variables in the points. I want to have in that dataframe…
JMCosta
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