tag:blogger.com,1999:blog-18406433194390811352011-12-26T00:43:32.416-08:00Thoughts on OSGeo, Open Source and the geospatial world.Frank Warmerdamhttps://profiles.google.com/110849704966597917580noreply@blogger.comBlogger131100tag:blogger.com,1999:blog-1840643319439081135.post-32329394490059003482011-11-05T14:21:00.001-07:002011-11-05T14:50:06.916-07:00

Andrew Ross has announced that all the FOSS4G 2011 and State of the Map videos are now up and available at the FOSSLC web site. Andrew provided the following urls to scan these two categories which gives an extended blurb about each video: http://www.fosslc.org/drupal/category/event/foss4g2011 http://www.fosslc.org/drupal/category/event/sotmHowever I prefer the search mechanism which gives lots

Frank Warmerdamhttps://profiles.google.com/110849704966597917580noreply@blogger.com0tag:blogger.com,1999:blog-1840643319439081135.post-56766091220977176982011-06-20T14:48:00.000-07:002011-06-21T12:38:18.920-07:00

Today I accepted a job with Google as a GIS Data Engineer. I will be based in Mountain View California at head office, and involved in various sorts of geodata processing though I don't really know the details of my responsibilities yet.I have received occasional email solicitations from Google recruiters in the past, but hadn't really taken them too seriously. I assumed it was a "wide net"

Frank Warmerdamhttps://profiles.google.com/110849704966597917580noreply@blogger.com46tag:blogger.com,1999:blog-1840643319439081135.post-2265340389561246532011-02-18T14:25:00.000-08:002011-02-18T15:09:47.863-08:00

Last week Thomas Bonfort, MapServer polymath contacted me with some surprising performance results he was getting while comparing two ways of handling image overviews with MapServer.In one case he had a single GeoTIFF file with overviews built by GDAL's gdaladdo utility in a separate .ovr file. Only one MapServer LAYER was used to refer to this image. In the second case he used a distinct TIFF

Frank Warmerdamhttps://profiles.google.com/110849704966597917580noreply@blogger.com0tag:blogger.com,1999:blog-1840643319439081135.post-37100219469042700962010-12-18T10:22:00.001-08:002010-12-18T10:54:14.049-08:00

Long time since my last post - my bad.Recently I have been working on a renewed FWTools for linux - hopefully I'll follow up on that later. Much like in the past FWTools is intended to work across a variety of linux systems (ie. Ubuntu, Redhat, Suse, Gentoo) and to not interfere with the native packing system nor to require special permissions to install. To that end we try to distribute as many

Frank Warmerdamhttps://profiles.google.com/110849704966597917580noreply@blogger.com1tag:blogger.com,1999:blog-1840643319439081135.post-47490676755134743952010-07-18T08:48:00.000-07:002010-07-18T09:16:45.090-07:00

Well, I just finished up a week of work implementing PCIDSK Vector write and update support. My next task is an upgrade to the OGR DXF driver requested by Stadt Uster to better meet their production requirements.They need the ability to control layer naming, production of dash patterns, and producing objects as block references.Currently the DXF writer is dependent on everything except the

Frank Warmerdamhttps://profiles.google.com/110849704966597917580noreply@blogger.com1tag:blogger.com,1999:blog-1840643319439081135.post-58740226037436607142010-06-17T11:24:00.000-07:002010-06-17T12:05:50.547-07:00

I have spent this week in beautiful Chicoutimi / Saguenay this week at the Rendez-vous OSGeo Québec. This is a two day conference put on by the local chapter here in Quebec in association with another local geomatics conference. It has been some time since I have been to a significant event, unfortunately having missed FOSS4G in Sydney, so it was good to be involved again. As long ago as the

Frank Warmerdamhttps://profiles.google.com/110849704966597917580noreply@blogger.com3tag:blogger.com,1999:blog-1840643319439081135.post-32474738097757695572010-03-14T19:32:00.000-07:002010-03-14T19:41:22.525-07:00

In the last few weeks, I believe I have made substantial improvements to the way datum shift information is derived from the EPSG dictionary for use in GDAL/OGR, PROJ.4 and related packages.The EPSG database model supports having multiple datum shift options for a particular datum, such as "Potsdam Rauenberg 1950 DHDN" to get to WGS84. This reflects the reality that datum conversion is often an

Frank Warmerdamhttps://profiles.google.com/110849704966597917580noreply@blogger.com2tag:blogger.com,1999:blog-1840643319439081135.post-57257939157479277832010-02-10T13:45:00.000-08:002010-02-10T13:51:46.950-08:00

Due to a serious bug in GDAL 1.7.0 resulting in all Erdas Imagine files produced by the release being unreadable to any non-GDAL applications, including Erdas Imagine, the project has decided to retract the 1.7.0 release. In it's place today we have issued a GDAL/OGR 1.7.1 release. I sincerely hope that use of 1.7.0 in the wild will not end up producing unreadable Erdas Imagine files that haunt

Frank Warmerdamhttps://profiles.google.com/110849704966597917580noreply@blogger.com2tag:blogger.com,1999:blog-1840643319439081135.post-27776490057824694492010-02-09T09:29:00.000-08:002010-02-09T10:53:55.222-08:00

Over much of the last decade I have fought with world mapping issues in MapServer. This falls into three broad areas - problems with requests crossing the dateline, problems with requests including the poles, and problems with requests extending beyond the domain of validity of a projection. Typically these are not a big issue when working on local mapping projects, but do become issues when

Frank Warmerdamhttps://profiles.google.com/110849704966597917580noreply@blogger.com2tag:blogger.com,1999:blog-1840643319439081135.post-38206740678767108482010-01-15T18:04:00.000-08:002010-01-16T14:48:43.408-08:00

In a diversion from my usual programming related geo-geeking, I'm heading to China on January 20th to do some in person, on the ground examination of geography. I will be visiting a friend there, and returning on the 29th. I will be visiting Shanghai, and Fuzhou (on the coast roughly half way between Shanghai and Hong Kong). Today I received my visa from the Chinese embassy. This is the first

Frank Warmerdamhttps://profiles.google.com/110849704966597917580noreply@blogger.com1tag:blogger.com,1999:blog-1840643319439081135.post-3843558380976587202010-01-04T19:48:00.000-08:002010-01-05T19:51:46.348-08:00

Recently Trent Hare indicated an interest in an extension to the gdaldem program to produce a color relief image mixed with a hillshade.The gdaldem utility is a utility program for producing various products from DEMs (elevation models). It was originally written by Matthew Perry, with contributions by Even Rouault, Howard Butler, and Chris Yesson to incorporate it into GDAL proper. It can

Frank Warmerdamhttps://profiles.google.com/110849704966597917580noreply@blogger.com7tag:blogger.com,1999:blog-1840643319439081135.post-66299152089465496842009-12-15T21:44:00.000-08:002010-01-05T19:52:44.894-08:00

This post will be incomprehensible.Over the last three days I have spent 4.5 hours working on GDAL Ticket 3276 related to a failure to use external overviews with JPEG2000 compressed NITF files - in particular for NITF files containing more than one jpeg2000 image.This bug was particularly hairy because it comes at the intersection of several things that are messy/complex in GDAL:JPEG2000 in NITF

Frank Warmerdamhttps://profiles.google.com/110849704966597917580noreply@blogger.com3tag:blogger.com,1999:blog-1840643319439081135.post-6452638912037693232009-12-05T07:48:00.000-08:002010-01-16T16:34:39.634-08:00

The last couple weeks I have been working on an OGR DXF driver. AutoCAD DXF format is a popular interchange format for CAD data, and to a somewhat lesser extent for goespatial map data often originating from engineering departments. It is a rather ugly format. Even though it is ASCII it is less than fun for humans to scan.The raw machinery of the format is published by Autodesk, and lots of

Frank Warmerdamhttps://profiles.google.com/110849704966597917580noreply@blogger.com4