SRTMTile

class pylayers.gis.srtm.SRTMTile(f, lat, lon)

Bases: object

Base class for all SRTM tiles. Each SRTM tile is size x size pixels big and contains data for the area from (lat, lon) to (lat+1, lon+1) inclusive. This means there is a 1 pixel overlap between tiles. This makes it easier for as to interpolate the value, because for every point we only have to look at a single tile.

Methods Summary

calcOffset(x, y)	Calculate offset into data array.
getAltitudeFromLatLon(lat, lon)	Get the altitude of a lat lon pair, using the four neighbouring pixels for interpolation.
getPixelValue(x, y)	Get the value of a pixel from the data, handling voids in the SRTM data.

Methods Documentation

calcOffset(x, y)

Calculate offset into data array. Only uses to test correctness of the formula.

getAltitudeFromLatLon(lat, lon)

Get the altitude of a lat lon pair, using the four neighbouring pixels for interpolation.

getPixelValue(x, y)

Get the value of a pixel from the data, handling voids in the SRTM data.