Friday, April 29, 2005

GRASS up and running!

Last night I managed to get the software going! Don't ask how I just sort of remembered old commands and it ran! I would describe my approach to GIS as similar to that of McGyver! I just improvise and it often works! But it also often doesn't!

Next steps will be to check out other datasets and to learn Mapserver. Also to startthinking of where tzo serve this data. Ask on TT if anyone knows of a Server where I might place this.

Emailed Nick Whiteledd to ask if he used the river data. Asked about experiences of SRTM data.

Thursday, April 28, 2005

EPSG number ascertained

Three positive developments.

The first is that I received carte blanche from the GLCF people in the States to use this data for free purposes. This will make the planned base map very good looking.

The second is that thanks to reading the metadata file along with the three GeoTIFFs I downloaded, I have been able to establish the project as UTM and datum WGS84.

The third is that I have ascertained the EPSG number for the dataset for my entry into GRASS which was required at setup. It is 32632.

But a new problem to solve came up.

I forgot how to set up datasets in GRASS! I must print and read the tutorials.

As I understand it you must create a directory called GRASSDATA in cygwin using the UNIX interface. This allows GRASS to "find" the directory later.

Possible solution might be to reuse the old SPEARFISH GRASS dir I have on my D Drive from ages ago, to sort of "initialise" the dataset usage.

This afternoon I edited the scripts to process the downloaded imagery. I never get time when there is a little one demanding to be played with!

Appendix:

Here si the GLCF letter:

Jeremy:Thank you for your interest in our data. There are no restrictions with regardto the use of our data. We simply ask that you credit the GLCF as the source ofthe imagery. Hope this helps. Sincerely,Matt Smith> Below is the result of your feedback form. It was submitted by> Jeremy Stocks on Wednesday, April 27, 2005 at 08:01:15> ---------------------------------------------------------------------------> > phone: +49-89-67346643> > message: Hello there,> > I have a query about the rights to use the Landsat data.> > I wish to set up a free website for GPS based tracking by bike or foót toshare> data in Germany. Is it possible to use GLCF data as a backdrop?> > Jeremy Stocks>

Wednesday, April 27, 2005

Landsat GLCF projection

Solved the problem of the Landsat datsset I downloaded. The info I need is in the .met file in the download directory.

Most data is in UTM. Germany is Zone 32 and all is embedded in the GeoTIFF format.

Now we have the info we need to set up the GRASS projection. But we need to set up the EPSG code value somehow....

Tuesday, April 26, 2005

Need the EPSG code

GRASS windows installed successfully.

Landsat images ready to go...

Now we need to establish the EPSG number then los geht's.....

Monday, April 25, 2005

Landsat and GRASS

Today I solved the GRASS install problem. You need to specify the URL of the "geni" GRASS site, and add it to the list of FTP sites to download Cygwin and GRASS together. How it has changed since I used to download the software!

Landsat imagery for 1999 are now downloaded for bands 245 and reside on my home PC ready for use.

Emails about European roads gave the response that I should go to VMAP0 for this data set. May be okay for the Autobahns.

Last minute poking about brought up German States as E00 fotrmat data under opengeodb, along with the PLZ its very useful.

Friday, April 22, 2005

Progress today

Succeeded today I finding the correct site for the Landsat imagery. Image size is 20-30 megs - okay.

OpenGIS seems to increase somewhat in traffic.

Pointed by Opengis to Berlin Bike Site. Cool but does it use copyright data?

Discovered yesterday river data and emailed Nick Whitelegg at Freemap. He was impressed and will investigate it.

GPS worked briefly today! Magellan emailed me with a reset hack.

Next step: download GRASS at home/work and get it running

Thursday, April 21, 2005

New free data found

Update:

Just added to the list of coverages:

Free river data,
an 1858 map which may be free of copyright,
PLZ codes matched to coordinates

Wednesday, April 20, 2005

Launch of Munich Free Mapping Initiative

This is the first posting of the above idea. It is inspired by an article in the Guardian I read a few weeks ago http://www.guardian.co.uk/online/story/0,,1453293,00.html and led me to the Free Map Project at http://www.free-map.org.uk/ and will atempt to do the following:

Provide free maps for all of Munich starting with a special app - Perlacher Forst Running routes

To this end I have downloaded and installed Mapserver at home to learn how it works.

then -

Get my old Magellan system working
Landsat 7 images of the city free via USGS and GRASS
SRTM height data
GPS collected waypoints by me
Appeals through websites like Toytown to collect waypoints on roads