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Questions tagged [map-projections]

A map-projection transforms the coordinates of the spherical earth to a flat map in cartesian (x,y) space.

A map-projection transforms the coordinates of the spherical earth, usually given in degrees (latitude, longitude), to a flat cartesian (x,y) space.
There is no perfect projection, it can be proved that each projection has a drawback, one have minor others major ones.

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Shapely not able to precisely find points inside polygon

I have several points and I would like to check if they are contained on a polygon. The polygon and the points are represented by latitudes and longitudes. Following is the code of to reproduce my scenario and the Google Maps print screen of what it…
Eduardo
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How do I map/plot my polygon onto a Europe map in MATLAB?

I have a shapefile with a transverse mercator projection. It also has false northings/eastings values associated with it in ArcGIS. I am trying to map the polygons onto a Europe map, but they are not showing up on it. When I use worldmap world the…
new2matlab
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How to add axis to map in cylindrical equal area projection? Why are the polygon lines at the border stretched out?

Goal Add axis that labels coordinates at 30deg latitude, 60deg longitude. Fix the polygon lines, around ~west Asia, eastern Europe. Question 1 I do not know what the scale of the axis is when I specify cylindrical equal area projection. (-180 to…
Bret Shandro
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Tile Projection Google Maps: Convert Distance to Screen Dimensions

I am using the CanvasTileProvider in Google Maps Android v2. I can convert lat long points to screen pixels. However I would like to create a method to convert a distance to screen pixels. This will allow me to draw a circle of x radius. Can…
Reafidy
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Calculation screen position from latitude and longitude

I have a video camera at a high building (eg. 10 storey high) looking at an area. The video screen is stream to display on my laptop. If I know a building’s latitude/longitude, how can I calculate what position (in pixels) I can mark out a cross on…
user3790147
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How to convert spatial coordinates to display on "CartoDB.Positron" map?

I have a SpatialPolygonsDataFrame [https://drive.google.com/file/d/0B5amt_a1FFXyZkd6eXF0czlReGc/view?usp=sharing] which is not projected. The spatial coordinates are range(long) = c(5e10 ; 8e10) and range(lat) = c(1e7,3e7). I want to use the package…
user34771
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Google Maps API. Projection

I'm trying to drag ImageView to google map and drop it as a marker. Map is in FrameLayout:
Lay'O
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KKJ3 Conversion Settings in Proj4js version 2.3.12

I have a problem to convert between KKJ3 and WGS84 projections. The location differs about 10 kilometers from original WGS84 when I convert KKj3 to back WGS84 ? It seems that longitude is ok, but latitude is not. In…
Timo Niemi
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Reprojection oceancolor data in raster?

regarding my previous question Read/Open Oceancolor data from MODIS with nc format. I have tried to read the ncdf oceancolor data download here using ncdf4 package with this code library(ncdf4) nc <- nc_open('A2014325053500.L2_LAC_SST.nc') # Get…
Eko Susilo
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Matlab shapewrite: export point shapefile + set projection to WGS84

I need to export a point shapefile from Matlab, but I can't figure out how to set the coordinates to WGS84 (which is maybe the most common one) using shapefile. It seems to be a non-trivial task. The command is: Struct2GIS = struct('Geometry',…
Oliver Amundsen
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Does projection in ArcGIS Desktop matter if my goal is to publish it in ArcGIS Online?

I have a couple layers in a map in ArcGIS Desktop. I will publish this in my ArcGIS Online account. Does it matter making all the projections of the layers the same in Desktop when my goal is to then publish it in ArcGIS Online (which uses Web…
Toronto23
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Standardised map projections per country or region for d3.js

Is there a list or database of standardised projections (that can be applied in d3.js) used to create "nice-looking" maps of invidiual countries (e.g. UK, France, Germany) or geographic regions (e.g. Europe, Middle East or North America)? e.g. in…
user3553107
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Projections into Cartesian Space from Latitude and Longitude for Kalman Filtering

I am trying to properly project Latitude and Longitude into cartesian coordinates so that I can use an unscented Kalman filter to smooth out some GPS data. I am using constant jerk newtonian motion as my state transfer matrix. My issue is that I…
Patrick John Steffanic
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OpenLayers - Get Geometry Projection

How can I get projection of a point or geometry in openlayers (2.12)? for example: x = 30.453789 , y = 35.637485 ==> EPSG:4326 and x = 3667550.3453 , y = 2205578.3453 ==> EPSG:900913 appreciate any help
Pedram
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Conversion from GeoJSON to TopoJSON renders a single path

So I had a GeoJSON of UK Counties (was actually KML before) and converted it to TopoJSON using the topojson node package. topojson -o map-england.json -p --simplify-proportion .2 topo-map-england.json This worked well in terms of reducing the file…
J86
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