So its been over six months since I made my first tutorial post about PostGIS. I now use PostGIS on a regular basis and thought it would be good to update the tutorial with some meat on how to use PostGIS.
Get some data and import it
Grab populated places points
wget http://edcftp.cr.usgs.gov/pub/data/nationalatlas/citiesx020.tar.gz
Grab US counties map:
wget http://edcftp.cr.usgs.gov/pub/data/nationalatlas/countyp020.tar.gz
Lots more data available in the National Atlas
Continue reading ‘Getting to know PostGIS Part II’
OGR is a part of GDAL and is very useful for converting between geospatial vector formats. What does that mean? When storing Vector GIS data there are a dizzying number of formats it can be stored in, some of the more popular of late, or at least well known are KML and SHP. A friend of a friend was looking to convert some SHP (Shapefiles) into KML so that he could make a Google Maps mashup and I helped him out. Here is a workflow for how I went about performing the conversion.
Continue reading ‘Using OGR to convert GIS Vector formats’
Using libsane and tesseract, you can scan from an ADF (or non ADF) scanner in Ubuntu 7.10 to a PDF and OCR’ed text document with a few easy steps.
First we need to make sure we have the necessary packages installed.
apt-get install tesseract-ocr sane-utils
Continue reading ‘Scanning with sane’s scanimage from an ADF scanner to PDF and OCRed Text’
Just did a stupid thing and deleted a whole tree of file on a windows partition. Never fear…ntfsundelete is here.
sudo ntfsundelete -u -d /destination/directory -f -m *.jpg /dev/sda1
Run without the -u option and -d options to show what can be recovered.
On ubuntu/debian to install it do:
apt-get install ntfsprogs
I am making the plunge to get more informed with how to use PostGIS. It is pretty impressive so far. Here is a quick tutorial which shows you how to get started and loading in a shapefile to play around with some fun SQL querying. I assume a basic understanding of the linux command line and some basic SQL skills.
To get started in ubuntu 7.04 (should work in 7.10 and debian too):
$ sudo apt-get install postgis postgresql-8.1-postgis
Next we’ll start setting up the PostGIS environment.
Continue reading ‘Getting to know PostGIS’
Synergy is a network KVM. It is great if you have multiple computers. I have a setup with a Powerbook, WinXP and Ubuntu Laptop all controlled by the same keyboard and mouse (across four screens) merged together into one desktop. It is a beautiful thing… Some simple config examples after the jump.
Continue reading ‘Synergy’
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