I have coordinates in Adindan UTM30N (Clarke 1880) that I want to re-project into Burkina Faso Transverse Mercator (BFTM). I've created custom projections in QGIS and MapInfo for BFTM using some parameters I've found, but the BFTM coordinates I'm getting when transforming with my custom projection don't match some example coordinates that I have, so I'm wondering if my custom projections are incorrect. Does anyone have any experience of the BFTM projection or could someone please verify the custom projection definitions I've created, given the BFTM parameters below?
Here's the PROJ4 string I've used to create the projection in QGIS:
+proj=tmerc +lat_0=0 +lon_0=-1.5 +x_0=600000 +y_0=0 +ellps=GRS80 +units=m +no_defs +k_0=0.9996
Here's the MapInfo projection string I've created:
"BFTM_TM_GRS80", 8, 33, 7, -1.5, 0, 0.9996, 600000, 0
And here are the BFTM parameters I have:
"The characteristics of the planimetric coordinate system of Burkina Faso are: The ITRF 2008 reference having as ellipsoid the IAG GRS80 (Half Major Axis a = 6 378 137.00 and Flattening 1/f = 298.257222101); BFTM map projection (transverse cylindrical Mercator projection); The Central Meridian 1° 30' west; The coordinates of the center of the projection (X0 = 600,000.00 m, Y0 = 0.00 m); The scale factor: k0 = 0.9996."
These are 2 example coordinates I have:
|Point|X_AdindanUTM30|Y_AdindanUTM30|X_BFTM|Y_BFTM| |-|----|-----|-----|-----| |A|485800|1100000|421249.7646|1100298.616| |B|496482|1100000|431941.1098|1100266.086|
These are the BFTM coordinates I get for the same 2 points when using my custom projections:
|Point|X_AdindanUTM30|Y_AdindanUTM30|X_BFTM_MyProj|Y_BFTM_MyProj| |-|----|-----|-----|-----| |A|485800|1100000|421339.8478|1100648.276| |B|496482|1100000|432025.7282|1100599.916|