openstreetmap to extract country for inkscape vector

I’ve made a debian package for the graticules2wld program. You can then pass these gcps to GDAL, to either warp the image or use gcps2wld.py (from the Debian package python-gdal) to make a best fit world file from the gcps. Base map is Public Domain.įrom the csv file I then can use my Java program graticules2wld to find a best fit world file (which is really just an affine transformation matrix) to georeference this raster image via a best fit approach.Īn alternative is to use to extract ground control points (GCPs) from the svg file by finding the intersection points of the graticules. After I have this svg file I run it through which extracts these vector graticules from the svg file and saves them into a csv file.Įxample of vector graticles drawn over the raster map. I do this by loading the image into Inkscape and tracing the graticules as line segments, with an svg path id for the segment something like “w220”, for example to indicate west 220. The first step is extracting the graticules from the raster map to vectors. Also I assume that the eastings and northings on the map are in chains. Actually I’m not sure what projection is used… but I think using a zone of universal transverse mercator should be okay. If we can extract this information we should be able to georeference the raster maps. Some of the parish maps have graticules shown and a reference origin for the easting and northing values on the graticules.

Keep in mind that the image coordinate system and projected coordinate system are different (assuming we are using some kind of UTM projection). …and a difference case, where the graticules are rotated in the other direction,įor the purposes of my java program (which I explain below), I define theta as the angle the east/west pointing graticules (I call them lat graticules as they are shown at regular lines of latitude) make with the horizontal, and phi as the angle the north/south pointing graticules (I call them long graticules as they are shown at regular lines of longitude) make with the vertical.

I remade the diagram from, into two views: pixel centric, and graticule centric ( svg versions here). I relied on lot on as a reference when figuring out how to make sense of world files. As part of my quest to georeference the old NSW Parish Maps, I ran into the ESRI World file format… The Format

Openstreetmap to extract country for inkscape vector