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Questions tagged [projection-mathematics]

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3
votes
1answer
143 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
37 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
16 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
74 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 ...