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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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is it possible to project ovals on Android MapView?

Working on a project that requires marking oval areas on a map. is this possible? has anyone done this before? Searching around I found lots of refrences of how to draw projected circles , but not ovals. would appreciate any insight or help. Thank…
user1666216
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Which segment of a polyline was clicked?

I have set up a sample polyline with five segments, and I'm allowing new markers to be created when the user clicks on the polyline. I'd like to know if there's a foolproof way to determine whether the new marker is between markers 0 and 1, or 1 and…
Heitor Chang
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How to read output of crs() in the Terra package in R

I have a SpatRaster and I want to figure out the EPSG code of it. I have used the crs() command and I got the following output: PROJCRS["unknown", BASEGEOGCRS["NAD83", DATUM["North American Datum 1983", …
RobertoAS
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The extent in UTM and the projection in lat lon

I have a raster with 4 layers and I want to convert the extent into lon/lat, in order to make the extract, but the points and the raster projection or extent doesn't match. Can you please help me ? pp.an class : RasterBrick dimensions :…
Alex.V
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Dotspatial.Projections Gives NaN Results for WGS84 to Wyoming StatePlane Conversion

I am having a basic problem using DotSpatial.Projections. I am simply trying to convert one point from Google's Geopgraphic CRS, used in Leaflet (EPSG Code: 3857), to US State Plane Wyoming East Central. I get back NaNs. Here is my simple…
Chris
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Finding differences in projections in R and projections in ArcMap

My current issue is creating an R program or function which creates a dataframe projection from latitude and longitude points to NAD-1983 2011 StatePlane Pennsylvania South FIPS - 3702 data. Currently, I've hit a snag. Here is the input data I've…
Lou Klein
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How to transform projection EPSG:3857 to EPSG:4326 in java (Geospatial)

Is there a way to transform a EPSG:3857 projection to EPSG:4326 in java? I'm using the esri java sdk. I went through the esri skd docs, but couldn't find a way to transform EPSG:3857 to EPSG:4326. Is there a way of doing it? I have a webMercator…
Rafael Paz
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How do I apply a datum adjustment to multiple CAD files in ArcMap?

I can create a world file (.wld) to adjust the projection of a CAD file to match my basemap in ArcMap. However, I have many CAD files to do this to. How can I automate or loop applying the datum adjustment factor to all of my CAD files? I've tried:…
Wes C
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Check if coordinates are valid EPSG 3857 , using Openlayers 5

I am using openlayers 5 along with angular6. I have created a simple form that user can give a X and Y of EPSG3857 coordinates, submit and a point will be rendered there and the map will zoom there. I am using a vector layer for that. I want to…
slevin
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Points in coordinates and shapefile in ft - Don't align even in same projection

I am trying to run a point-in-polygon count in QGIS. I have a shapefile of San Diego zip codes in NAD83 (2230 EPSG). I have a delimited text file of points with lat/lon coordinates. In QGIS, I can get the points to overlay properly on the polygons…
mmalloy
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Is there any way to get Bing maps and Google maps to agree?

I was working on a mapping solution for WP7 and so wanted to use Bing maps as part of the solution. I learnt that Bing maps doesn't quite get the locations "right", where Google maps seems more accurate. Are there some properties I can set on my…
Irwin
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How can I convert UTM coordinates from Meters to Feet?

Does anyone have a formula or conversion that will switch my UTM coordinates from Meters to Feet? I found Javascript code that will convert UTM coords in meters to Lat/Long but I will need my UTM in feet before I convert it to Lat/Long.
Josh
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Is it need to covert wgs84 to web mercarto projection?

I have a question about projection. My big gps data is all in wgs84 fomat. Is it need to covert my gps data to web mercarto(epsg3857) befor doing some analysis or visualization, such as determine points are inside a polygon. Can I don't do the…
jie lin
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