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Questions tagged [projection-mathematics]

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2
votes
0answers
34 views

Is there a difference in using Haversine distance vs re-projecting coordinate frame?

I have a GeoTIFF raster file in the EPSG 4326 (WGS 84) geographic coordinate system. I want to crop a 20 km x 20 km square around a particular (lat, long) coordinate, and save that as a new raster. ...
3
votes
1answer
63 views

Procedure of transforming coordinates?

I'm trying to understand the math behind this transformation. I should note that I've been able to perform the transformation using GeoPandas, but I'd like to understand what is going on under the ...
1
vote
0answers
16 views

Transformation from Sphere_Natural_Earth to WGS1984

I have a set of files that are stored in Tom Patterson's Natural Earth Projection, and I would like to convert them to WGS1984. This will require a transformation, but I can't locate one and don't ...
0
votes
0answers
23 views

Correlation between varying bearings

Problem: The Bearing of point B from point A on one datum and projection varies from that on another datum and projection. Can a consistent correlation be established for the variation in the Bearings?...
3
votes
1answer
209 views

Projecting points on line and calculating distance from line start

I have a vector layer with a number of points which correspond to magnetic targets axis retrieved from AutoCAD The task is to project the points on the axis and then calculate the distance of each ...
0
votes
1answer
56 views

What parameters do azimuthal and transverse cylindrical projection in secant case have as proj4 string

conical equal-area projection, secant case has e.g. +proj=aea +lat_1=... +lat_2=... +lon_0=... +lat_0=... +x_0=... +y_0=... etc... I would ask if there is such thing, for transverse cylindrical ...
0
votes
0answers
25 views

Will I get the same area results using different equal area projections in QGIS?

If I want to calculate areas with $area in QGIS in metric units (sq. unit) of a vector layer containing polygons represented in WGS84 lat/lon, I must reproject the layer onto an equal-area projection. ...
5
votes
2answers
142 views

Geometric difference between equal-area and conformal projection

For simplification, let's have a source light for a map projection. I know where to put the source light in order to get an orthographic, stereographic, gnomonic map projection, but I still don't ...