New answers tagged georeferencing
The columns mean: Geographical easting/longitude Geographical northing/latitude Location of the ground control point in image pixel space from left to right Location of the ground control point in image pixel space from top to bottom Boolean selection if the GCP should be used (1) or not (0) in computing The anchor point in the image space is at top-left ...
The following is basically quoted from the book: "Mastering QGIS" by Kurt Menke, Luigi Pirelli, Richard Smith Jr & John Van Hoesen on page 199: mapX and mapY are the Destination Coordinates. pixelX and pixelY are the Source Coordinates. enable has a boolean value where 1 means it will be used in the transformation; 0 means it will not be used. Hope ...
As you say you are using an image with GPS data in it the information is going to have been most likely stored in WGS84. Identify the part of the world you are working in, either by researching the source of the image and or imformation on the image. From there either project the GPS data using WGS84 as the datum into an appropriate UTM Zone that covers ...
Your last attempt looks very promising. With more than 5 points you might get an even better picture. I use this transformation settings: Using as many border points as possible for georeferencing, I take the coordinates from the map canvas with the middle icon: and get this picture (with clipping to GADM borders):
It depends what you mean with georeferencing. There actually is the ST_Georeference function which doesn't change the raster itself, it simply defines where the raster is located in space by setting 6 offset/scale/skew coefficients. As mentioned by @JohnBarça, your raster should have the proper georeferencing metadata, but sometimes it doesnt, and that is ...
ArcGIS 10.3 has a PDF to TIFF conversion tool, but it doesn't work on USGS geoPDF files. You get a mostly white image with some junk data from the PDF.
SketchUp is not loosing the georeference, you can import, edit and export a model and it will keep its position. Even if you work within a national georeference system. Its not necessary and maybe harmfull if you define the location for your project.
You can't automatically georeference imagery. You need to tie it into key points. Unless you have a coordinated bounding box for the image (which is kind of like a georeference any way). If your images are georeferenced and you want to ortho-rectify (meaning, remove terrain distortions) then I think it will be a little tricky, but see here for open source ...
A new PDF to TIFF tool has been added to ArcGIS 10.3 for Desktop: Exports an existing PDF file to a Tagged Image File Format (TIFF). If the PDF has georeference information, the TIFF can be a GeoTIFF. These TIFFs can be used as a source for heads-up digitizing and viewing in ArcMap. Both GeoPDF and ISO standards of georeferenced PDFs are ...
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