12 Jun 2009
OK, this one I have to share. Here’s two queries, the first with a syntax error in the WKT (oops!) and the second one correct.
First, as processed by MySQL:
mysql> select count(*) from tiger_roads_texas
where mbrintersects(geom,
GeomFromText('LINESTRING(452284 -1651542, 452484 -1651342'));
+----------+
| count(*) |
+----------+
| 0 |
+----------+
1 row in set (0.00 sec)
mysql> select count(*) from tiger_roads_texas
where mbrintersects(geom,
GeomFromText('LINESTRING(452284 -1651542, 452484 -1651342)'));
+----------+
| count(*) |
+----------+
| 1 |
+----------+
1 row in set (0.06 sec)
Now as processed by PostGIS:
tiger=# select count(*) from tiger_roads_texas
where geom &&
GeomFromText('LINESTRING(452284 -1651542, 452484 -1651342',2163);
ERROR: parse error - invalid geometry
HINT: "...RING(452284 -1651542, 452484 -1651342" <-- parse error at position 43 within geometry
CONTEXT: SQL function "geomfromtext" statement 1
tiger=# select count(*) from tiger_roads_texas
where geom &&
GeomFromText('LINESTRING(452284 -1651542, 452484 -1651342)',2163);
count
-------
1
(1 row)
Can you spot the difference? Snark! Another one for the list.
10 Jun 2009
A WMS performance benchmark has been a staple of FOSS4G conferences for some time. In 2005, it was IMS vs Mapserver. In 2007 it was MapServer vs Geoserver. And in 2008, a grudge MapServer vs Geoserver re-match.
For 2009, we hope to continue the MapServer vs Geoserver tradition, and are inviting other WMS servers to join the fray. We are hoping to have ArcGIS Server in the mix, perhaps MapGuide, perhaps DeeGree. The participants are assembling on a benchmarking listserv.
However, right now we are stuck trying to find a location for our gunfight – we need an OK Corral. Our preferred corral would have the following characteristics:
- One or more dual-core processors
- 4Gb of more of RAM
- Centos or RHEL
- Remote ssh access for participants
- Root access or sudo for participants
- Not virtualized
In addition, we will need a second server on the same network segment for generating load (would still need remote access, but would not need a beefy machine). Due to the nature of the participants (global) and the timelines (several months) we would need sole use of the corral until the testing is complete in September.
If you have a corral you can donate for the shoot-out, let me know!
Update: We have received a generous offer from the US Army Corps.
02 Jun 2009
I’m a nice guy, I often raise ESRI’s web services (formerly ArcWeb Services, now ArcGIS Online) when talking to clients about options for things like map services, geocodes and routes. It’s my way of rooting for the scrappy underdog, the old paleogeographic home team, going up against the Google and Microsoft Bing behemoths.
But someone, please, tap the Redlands team with the clue stick… check out the fabulous new “free” services ESRI is offering to lure developers to their ecosystem!
Free geocoding! Yes! Free! And as many as 1000 geocodes per year. You read that right, kids, per year. Also routing! 5000 per year!
Compare with Yahoo!’s (aside, something about putting an apostrophe after an exclamation mark feels wrong) free API, which offers 5000 geocodes per day (Google offers 15000).
There’s a punch-line in here somewhere, but I’m not sure where.
Update: Ray from ESRI notes in the comments that “… the limit of 1,000 geocodes is for geocodes done in BATCH MODE (ie: a request involving more than one address at a time). Place-finding, single address geocoding and single address reverse geocoding are not limited.” I may have had it completely backwards, ESRI is not being too stingy, they are being too generous. I’m pretty sure there’s lots of people who can script their computers into running lots of sequential individual geocoding requests … in a “batch”, as it were.
Update 2: Ray from ESRI further clarifies the meaning of “batch”: “Batch geocoding really means that you are storing the results of your request locally, so you can use them again.” So the “batchness” of your request is not governed by the size of the request, but by what you do with the request. (Wait, I’ve heard that somewhere before…) Comparing to the Yahoo! terms of use we find a similar restriction, which means the ESRI offering is the-same-only-better (fewer restrictions on non-“batch” requests). Better put away the clue-stick, nothing to see here, move along, move along.
01 Jun 2009
Bill Dollins nails it:
In general, the perception of risk equals the presence of risk.
Like “truthiness”, risk is in the eye of the beholder. Which leaves me working to help sell a software-based solution for a problem that exists, for the most part, in people’s heads. Open source software vendor, or psychiatrist, you be the judge. Also, potential hole in the business plan – what happens when people finally wise up?
28 May 2009
I never thought I would feel sorry for the Beast from Redmond, but they seen to be regularly plumbing new lows. Microsoft Bob, you have a new rival for Worst Marketing Brainwave Ever, and his name is Bing.
(And now I have to change all my presentation slides to refer to “Bing Maps for the Enterprise”? Flibbitty Jibbets for the Enterprise? Google at least managed to turn their silly name into a verb before plastering it everywhere in sight. Bing?!?)
