This list of resources is all about acquring and processing aerial imagery. It's generally broken up in three ways: how to go about this in Photoshop/GIMP, using command-line tools, or in GIS software, depending what's most comfortable to you. Often these tools can be used in conjunction with each other.
Detailed walk through of building extraction using postgis
First lets pull a data layer from of openstreetmap. You can do this any which way you’d like, as there are a variety of methods for pulling openstreetmap data from their database. Check the [wiki] (http://wiki.openstreetmap.org/wiki/Downloading_data) for a comprehensive list. My favourite method thus far is pulling the data straight into QGIS using the open layers plugin. For those who may want to explore this method, check [this tutorial] (http://www.qgistutorials.com/en/docs/downloading_osm_data.html). For building extraction you only need building footprints, and include the building tags. Not all polygons are of type building in OSM, so we can download all the polygons, and then filter the layer for only polygons tagged as buildings.
LiDAR data was pulled from USGS via the Earth Explorer site. [Here] (http://earthobservatory.nasa.gov/blogs/ele
| Mapnik supports the PROJ.4 WKT for projections and buried deep in the doc's is one called | |
| 'Two Point Equidistant'. You provide the left and right points and the map is rotated | |
| such that these two points are horizontal in the output. | |
| This allows you to rotate the map to any angle (including south up!!) and the text is | |
| rendered correctly! You don't have to change the projections of your input vectors. | |
| Simply tweak the mapnik generate_image.py script like this: | |
| Change: |
| Here's how I installed hg-git on Windows using the MinGW compiler. | |
| PREPARE | |
| ------- | |
| - Install Python (http://www.activestate.com/activepython/downloads) | |
| - Install the Python package manager, setuptools (http://pypi.python.org/pypi/setuptools) | |
| - Install the MinGW installer (http://sourceforge.net/projects/mingw/files/Automated%20MinGW%20Installer/mingw-get/) | |
| - Install the C compiler, MinGW gcc, and a utility, pexports, to help create the import library |
| import sqlite3, os | |
| conn = sqlite3.connect('Mills1860.mbtiles') | |
| results=conn.execute('select * from tiles').fetchall() | |
| for result in results: | |
| zoom, column, row, png= result | |
| try: | |
| os.makedirs('%s/%s/' % (zoom, row)) |
| #!/usr/bin/env python | |
| from optparse import OptionParser | |
| from xml.dom.minidom import parse | |
| import os | |
| import sqlite3 | |
| datatypeMap = { | |
| 'integer': 'INT', | |
| 'datetime': 'DATETIME', |