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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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Detecting the projection of an SVG map

I have an SVG map (called "external map" hereafter) representing a portion of the globe ; along with a map of the globe ("background map") in its entirety. I would like to be able to detect what projection the external map uses (my final aim being…
Bruno Pérel
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Converting a point on a TOAST map to the lat/lon on a sphere

I have an image of a map of a planet in the TOAST projection of size n, where n is a power of two. I would like to take a pixel on the TOAST map and calculate the latitude/longitude of the corresponding point on a sphere. I have the following…
Drakekin
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Openlayers 3 circles from geojson not working with layer tile source different from TileWMS

I am working with openlayers 3 with a layer from mapbox or openstreetmap and I need to draw some circles on it. I am able to print the circles with a view with a projection EPSG:4326, but then I have no map. Changing the projection with a transform…
hosseio
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How does QGIS read in projection information from hdf5 files? Projection info not recognized

When i bring an HDF5 file into QGIS that contains raster information, the data visually appear however spatially, they are not projected properly. QGIS does not read the spatial CRS information embedded in the hdf5 file. Does anyone know what QGIS…
Leah Wasser
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Is it possible to translate an SVG path to GeoJSON?

My objective here is to allow users to specify territories or regions given a background world-map overlay, which is an SVG generated from GeoJSON data using D3. I have done the part where the territories' points are pinpointed by the user, and an…
Bruno Pérel
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OpenLayers 3 icons projection

I'm making a map with OpenLayers 3, I have coordinates (EPSG:3857) in PostgreSQL and the map layer is OSM (same projection that the icons, EPSG:3857). The problem is that when I increment the zoom, the icons disappear... But if I decrement then the…
user4247129
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Selecting Coordinate System in Maptiler

I have an image which 21810x14872 that project a box of an area with coordinate: top, left corner latitude longitude : 23.635069763547662 , 58.09107365049769 bottom, right corner latitude longitude : 23.598520470202025 , 58.14957297881731 OR using…
user836026
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calculating the area (in feet / km) of a polygon in d3 maps

I'm trying to figure out how to get the polygon's area (eg, a town) in feet/km on my d3 map. Currently have this as a way to get the distance from one point to another http://www.movable-type.co.uk/scripts/latlong.html I'm not sure if there's a…
gdubs
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Create a custom map projection in d3.js for EASE-Grid

I'm trying to create 3 different projections for the EASE-Grid projection: http://nsidc.org/data/ease/ease_grid.html#nh_map Northern Hemisphere Azimuthal Equal-Area Projection, Southern Hemisphere Azimuthal Equal-Area Projection , and Global…
user176855
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I can't draw my current Position on a Nutiteq Map

I try to draw a blue translucent circle to show my actual GPS Position on Nutiteq's Map but it shows no circle. I want to display something like this My Code is the following Circle Class public Circle(MapView mapView, MapPos mapPostPoint, float…
Gödel77
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How can I turn MapPos/(long,lat) into Pixels under Nutiteq?

I have deeply read the Nutiteq Api Reference and I haven't found built-in Methods to get the pixel representation of longitude and latitude on a device. There is nothing under the existing Projections, so I don't know how I could overcome this…
Gödel77
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Some Google Map API v3 Custom Projection Markers Not Showing

I'm trying to put together a Image map with a custom projection. I borrowed code from the following 3…
Mitch
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postgis projection pixel shp2pgsql

I have created a database and enabled it spatially with postgis. I would like to store data from a shapefile into it. If I specify a projection, it works well. But, we would like to store in pixel projection, meaning no projection. If I do not give…
Test
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How to sync rasters with different projections

I would like to syncronize two geotiff files with different extent and different projection system. I'm try using spatial_sync_raster but it didnt work. How should I do ? Below are the details of the file. class : RasterLayer band : 1 …
user3666974
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Matlab m_map projection m_ll2xy units

For projection I am using m_proj('Mercator') Next I use the following to convert an array of lon and lat points into x y coordinates. [x,y] = m_ll2xy(lon,lat) The [x,y] I got were in some units that I didn't understand. For example the x…
Ron
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