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1500 questions
32
votes
6 answers
Read a table from an ESRI file geodatabase (.gdb) using R
I am trying to read a table directly from an ESRI file geodatabase into R. An example data file can be downloaded here. The database contains a point feature class (Zone9_2014_01_Broadcast) and two linked tables (Zone9_2014_01_Vessel and…
Cotton.Rockwood
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32
votes
2 answers
Filtering features in other layers of QGIS Atlas
I'm trying to use the QGIS Atlas tools to build student 'scattermaps', i.e. display the school and the students that attend that school, for 215 schools.
The schools layer is the coverage layer, and is being driven by the SCHNUM (school number)…
DPSSpatial_BoycottingGISSE
- 18,790
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32
votes
8 answers
Returning lat and long of centroid point with GeoPandas
I would like to return the lat, lon or x, y from the point object in the following series as I plan to link them with an API I built that links OSM and NetworkX. The centroids will be added as new nodes for network…
dassouki
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- 115
32
votes
3 answers
How to encode shapefiles from LATIN1 to UTF-8?
Is there a way to encode shapefiles from LATIN1 to UTF-8?
againstflow
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32
votes
6 answers
Are there open source alternatives to ArcCatalog?
I'm looking for open source alternatives to ArcCatalog. The software should run on both Win and Linux and support the usual file formats (shp, kml, gml, ...) and databases (especially PostGIS, additional SpatiaLite support would be great). I'd like…
underdark
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32
votes
1 answer
Getting layer by name in PyQGIS
I have a plugin which finds buffer for list of cities, provided the distance. The state and city names are taken from the attribute table and gets filtered accordingly. What I want is my plugin should identify the layer name or order of the layer in…
User123
- 2,986
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32
votes
1 answer
WMTS : Convert geolocation (lat, long) to tile index, at a given zoom level?
I wanted to know how to get the indexes (x,y) of a WMTS tile for a given geolocation (latitude, longitude) and zoom level.
For exemple, I have a POI located at (48.675, 2.7), I want to get the corresponding open-street-map tile for the zoom 10.
Can…
Neekobus
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- 8
32
votes
4 answers
When should you NOT use a spatial index?
I am asking this because I was mainly working with Oracle but for the past year I've been doubling with PostGIS and SQLServer 2008. Most spatial functions in Oracle won't work without a spatial index returning the ORA-13226 error:
13226, 00000,…
mapoholic
- 2,360
- 18
- 20
32
votes
7 answers
Spatial resolution of Google Earth Imagery
What is the spatial resolution of imagery used in Google Earth? At various places on the web, I have been reading it varies from place to place - 60 cm, 2.5 m, 15 m and so on. I was wondering if there is any way/tool to find out what is the spatial…
Chethan S.
- 4,849
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32
votes
7 answers
Joining multiple records to single feature using QGIS
I'm trying to create a join/relate in QGIS where I have a shapefile of buildings and to that I would like to join a non-spatial table (.csv-file) containing people who work in each building. So I have multiple records in my table that I would like…
Mick
- 321
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- 3
32
votes
2 answers
Where is the Merge selected features button in QGIS 2.2?
I can't seem to find the "Merge selected features" button. I need to merge several polygons inside a shapefile and can't find how to do it in this version. (I was running on Wroclaw until 2.2).
Is the Merge selected features button still included…
TTome
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31
votes
7 answers
Methodology for creating accurate drainage networks (and catchments) from high resolution LiDAR DEM?
This is not the first time I've stumbled over this issue; it seems that I am unable to generate a correct drainage network model and the resulting catchments from full resolution (1m cells) LiDAR data.
When I generalize the LiDAR dataset, convert…
Jakub Sisak GeoGraphics
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- 20
- 104
- 180
31
votes
6 answers
How to buffer raster pixels by their values?
The pixels to the left represent tree locations and their associated crown radii (i.e. pixel values ranging from 2 - 5). I would like to buffer these raster pixels by their crown radius value. The image to the right is what I am hoping to…
Aaron
- 51,658
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- 317
31
votes
3 answers
setStyle() function for GeoJSON features - Leaflet
Ok, since I already asked a very long question about this, but since it didn't get any new replies for a while, and not to get confused in details, I will keep this one simple the best way I can.
If I'm not mistaken, a setStyle function for a named,…
Doruk Karınca
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