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1500 questions
68
votes
9 answers
Finding nearest point in other GeoDataFrame using GeoPandas
I've got two geodataframes:
import geopandas as gpd
from shapely.geometry import Point
gpd1 = gpd.GeoDataFrame([['John',1,Point(1,1)],['Smith',1,Point(2,2)],['Soap',1,Point(0,2)]],columns=['Name','ID','geometry'])
gpd2 =…
RedM
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68
votes
5 answers
Clipping raster with vector boundaries using QGIS
In QGIS I would like to clip a raster precipitation layer using an admin boundary layer that is vector data. However the Geoprocessing tools seem to be usable only for vector data.
How can I clip this precipitation layer?
Kirk
- 681
- 1
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66
votes
2 answers
Selecting features within polygon from another layer using QGIS
I'm using QGIS 1.8 with a PostGIS database and I have three PostGIS layers in QGISL: a lines, a points, and a polygon.
I'm trying to select features in the polygon layer and mark all points within this polygon.
For me the only way to do this is to…
Novice
- 661
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- 3
66
votes
3 answers
Layers with same coordinate system should align/overlap in ArcMap but do not?
I put 4 different layers into my ArcMap document, but only one of them will show up on the map! I should be seeing the other 3 layers as well. When I do a Zoom to layer, I can see one layer, but I cannot figure out how to make the other 3 show up at…
CaliforniaGirl
- 681
- 1
- 6
- 3
66
votes
3 answers
Installing latest QGIS version on Ubuntu?
I am relatively new to Linux, so can you indicate the exact commands (step-by-step) that I need to type to get the latest QGIS installed on Ubuntu 14.04.
I have tried to follow the instructions provided here…
MARIO
- 769
- 1
- 5
- 5
65
votes
5 answers
Building effective heat-maps?
Using ArcGIS, QGIS, Grass, and/or GVSIG:
What are some of the tools and processes involved in building effective heat maps?
What are the plugins involved?
What are the major data requirements?
What are some of the flaws with existing heat…
dassouki
- 8,563
- 12
- 64
- 115
64
votes
7 answers
What strategies, criteria, or rules to use for selecting coordinate systems?
What strategies, criteria, or rules do you use for selecting coordinate systems for
(a) storing,
(b) analyzing, and
(c) displaying GIS data?
(I humbly offer my reply to a related question about watershed analysis as an example of the…
whuber
- 69,783
- 15
- 186
- 281
64
votes
8 answers
Seeking sources for US Zip Code Boundaries
What are the most up-to-date source for US Zip Code boundaries?
My first thought was TIGER, whenever that comes out, but then I thought that the Postal Service might be a better bet.
jvangeld
- 2,292
- 5
- 20
- 34
64
votes
5 answers
Seeking Mobile GIS applications for Android Tablets?
I know that ArcGIS is available for Android, but does anyone know of any other GIS apps that are available for Android tablets?
brian.landes
- 61
- 1
- 3
- 3
63
votes
7 answers
How to remove Esri basemap credits?
As you can see from the attached sample map, the Esri basemap credits are overpowering and reduce the cartographic design of the entire map. These credits appear to be new to 10.1 and essentially make these maps unusable in any sort of publication.…
Aaron
- 51,658
- 28
- 154
- 317
63
votes
3 answers
Changing SRID of existing data in PostGIS?
While importing my shapefile data to PostGIS, I did not select the proper Projection.
How do I now change the SRID of the data, without transforming the Coordinates?
Devdatta Tengshe
- 41,311
- 35
- 139
- 263
62
votes
12 answers
Visualizing speed of movement on static (= printable) map?
Imagine you're tracking, for example, vehicle or animal movement and receive regular GPS position updates. How would you visualize speed of movement on a static (= printable) map? I've been coloring the points in red-yellow-green where red would be…
underdark
- 84,148
- 21
- 231
- 413
61
votes
2 answers
Inserting point into PostGIS?
I have created one table in my PostGIS nut I cannot insert point.
What is wrong with my query?
CREATE TABLE app (
p_id INTEGER PRIMARY KEY
);
SELECT AddGeometryColumn('app','the_geom','4326','POINT',2);
INSERT INTO app(p_id, the_geom)…
Shahjalal
- 1,163
- 3
- 12
- 16
61
votes
5 answers
Bypassing 10 character limit of field name in shapefiles?
I'm exporting geometry with attached text attributes from oracle database to esri shapefile format (.shp) with Java and Geotools library.
Attribute columns in our database have names with more than 10 characters, and Geotools forces to truncate…
denu
- 839
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- 10
60
votes
6 answers
One dimensional map of the world?
Bit of a strange question but hope this is OK to ask here.
Has anyone heard of a '1-dimensional' projection of the world map - that is mapping all the points on the globe to a single line?
I was thinking of doing such a thing - trying to keep cities…
utunga
- 883
- 6
- 10