I am pretty confused by projecting data from one coordinate system to another, especially if multiple transformation options are available (ArcGIS 10.4).
I downloaded Landsat LT5 data (origCS = GSC: WGS84, EPSG:4326) and I reprojected it to final PCS: S-JTSK (desiredCS = EPSG: 5514). Multiple transformations are available in ArcGIS:
I therefore applied the NGA transformation (S_JTSK_To_WGS_1984_NGA, called _nga) and further processed and classified my rasters.
Now, I am thinking to change the way how Landsat has been projected, i.e change transformation #1 to transformation #2, keeping the original (WGS84) and final coordinate systems (S-JTSK) the same.
If that is possible and "legal", what is correct approach to do that?
As processing of my projected rasters has taken lot of time, I don't want to start again with the raw Landsat data, and I prefer to play around with transformation of classified rasters.
My thoughts how to change transformations of final rasters are:
- simply transform the
raster_t2(from one transformation to another, staying in S-JTSK) - is this possible?
- project one landsat_wgs to lansat_t2 (by transformation 2) and use it as master scene to resample final classified rasters?
- something else??
- is this needed or even not at all??
I am working on study area of size 400 km2, using single Lansat scene per time.