gis Questions
10
Solved
Is there the equivalent of the "Hello World" program for GIS applications?
I am looking to become more familiar with the development of GIS applications. What are the popular (and free/low c...
Samoyedic asked 9/1, 2009 at 19:30
3
Solved
What I like to do
I like to plot isochrones from multiple locations on a map so I can visually find the travel time from an arbitrary town to the closest location. It should look like a kernel den...
2
How to get the baselayer selected in leaflet?
Ingrained asked 16/11, 2015 at 17:17
2
Solved
It might be a easy problem but I don't seem to figure it out. I'm using GeoDjango and I have a latitude and a longitude that I converted into strings (see my_lat and my_long).
For some reason it d...
1
I am getting results I don't understand when creating or combining polygons to cover most of the globe.
If I use one polygon, GEOS assumes the shortest boundary between coordinates. So the followin...
7
Solved
I am trying to put a SHP file into my PostGIS database, the the data is just a little off. I think this is because I am using the wrong SRID. The contents of the PRJ file are as follows:
GEOGCS["G...
1
I'm trying to make my leaflet map show no legend when both layers are selected, and when only one layer is selected show that layer's legend.
I found these solutions using Javascript:
How to swi...
14
Solved
I have a bunch of files with coordinates in UTM form. For each coordinate I have easting, northing and zone. I need to convert this to LatLng for use with Google Map API to show the information in ...
Argot asked 5/12, 2008 at 13:42
7
Solved
Say I have an arbitrary set of latitude and longitude pairs representing points on some simple, closed curve. In Cartesian space I could easily calculate the area enclosed by such a curve using Gre...
4
Solved
I would like to plot some different data items using ggplot2, using two different colour scales (one continuous and one discrete from two different df's). I can plot either exactly how I would like...
18
Solved
is there any possibility to determine the timezone of point (lat/lon) without using webservices? Geonames.org is not stable enough for me to use :( I need this to work in PHP.
Thanks
Conceptualism asked 7/4, 2011 at 16:45
2
Solved
I am trying to change the CRS of a raster tif file. When I assign new CRS using the following code:
with rio.open(solar_path, mode='r+') as raster:
raster.crs = rio.crs.CRS({'init': 'epsg:27700'}...
6
This should be simple, but when I look for it I just find web packages. I need something better than as oriented on This Blog. Maybe using .oms file or shapefiles. Some way to give bbox and get the...
Ecumenical asked 5/5, 2015 at 12:29
5
I have the seemingly tricky challenge of trying to work out a path, by sea, from one sea port to another sea port. The eventual aim is to plot this on a Google (or Bing) Map as a polyline.
The pat...
Ibanez asked 14/11, 2011 at 10:59
4
Solved
I have been working on earthquake data that has lat long values, and I want to convert those lat long values to spatial coordinates.
Suppose I have the following data set df:
longitude latitude
...
Ashelman asked 19/4, 2015 at 22:21
15
Solved
Given an existing point in lat/long, distance in (in KM) and bearing (in degrees converted to radians), I would like to calculate the new lat/long. This site crops up over and over again, but I jus...
Furnishings asked 28/8, 2011 at 16:56
4
Solved
I have an image of land cover and I segmented it using K-means clustering. Now I want to calculate the accuracy of my segmentation algorithm. I read somewhere that dice co-efficient is the substant...
Thruster asked 7/7, 2015 at 15:57
7
Solved
Is there an easy way to get the name of the country on whose territory a given point is located?
I don't care too much about accuracy nor about ambiguities given by political disputes. Just need a...
Fought asked 3/9, 2010 at 6:33
1
I have 2 PySpark dataframes: one with points df_pnt and the other with polygons df_poly. As I'm not very familiar to PySpark I'm struggling with correct join of this dataframe on the condition whet...
Haith asked 6/3, 2020 at 16:16
2
Solved
I have a GeoDataFrame (let's call it Destinations) that was made from a point shapefile using GeoPandas. For every feature (correct me if the terminology is wrong) in Destinations, I need to find t...
10
Solved
I receive the latitude and longitude from GPS with this format:
Latitude : 78°55'44.29458"N
I need convert this data to:
latitude: 78.9288888889
I found this code here: link
import re
def dms...
3
EDIT: PARTIAL SOLUTION
Using gdal_translate in the command line seems to do the trick, even though the Python binding doesn't work.
This worked to crop a GeoTiff removing 300 pixel padding from ...
6
I am using mapdotnet services for our gis application to load the shapefiles, and this mapdotnet service wants the proj4 details. I'm getting them from spatialreference.org, but for this projection...
Diathesis asked 30/6, 2010 at 12:13
4
Solved
I'm struggling for hours to get my query work but with no success.
I have a table with a GEOMETRY column which stores the POLYGON of a given area from sub-localities.
Now i want to Union them all t...
7
I have a map that I have digitised and converted to a vector layer (the rivers only).
The problem is that the vectorisation has produced a large number of segments for each river, that show up as d...
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