archive

Archive for 2010

Satellite Sensors & Resolution

Monday, October 11th, 2010

Nice resumé of current satellites and their characteristics.

File Downloader

Thursday, October 7th, 2010

Neat utility (also with Firefox plugin) to download a bunch of files via HTTP from a server.

Citation Strength

Tuesday, October 5th, 2010

This visualization gives an overview of the whole citation network. The colors represent the four main groups of journals, which are further subdivided into fields in the outer ring. The segments of the inner ring represent the individual journals, scaled by Eigenfactorâ„¢ Score. In the initial view, the top 1000 citation links are plotted. Line size and opacity represents connection strength.

Map Your Moves

Tuesday, October 5th, 2010

Nice visualization of people moving from one place to another.

Statistical Mapping

Friday, October 1st, 2010

Nice Web GIS application from the swiss government.

Data Visualization (Compact) Video

Thursday, September 30th, 2010

Putting Into a New Dimension

Tuesday, September 28th, 2010

The concept behind BBC Dimensions is relatively simple: take a specific important place, event or ‘thing’, and overlay these artefacts onto a map of one’s local neighborhood.

TED Talk: Rachel Sussman: The world’s oldest living things

Tuesday, September 21st, 2010

Short Interview

Tuesday, September 7th, 2010

Just to bookmark it somewhere… Interview at WebValley 2010…

Data Converter

Tuesday, September 7th, 2010

Takes CSV or tab-delimited data from Excel and converts it into several web-friendly formats, include JSON and XML.

Boxplot

Thursday, August 26th, 2010

Great script (in CSS and Javascript) which makes it really easy to display boxplots on a website. Great!

Excel: Concatenate Multiple Fields

Tuesday, August 24th, 2010

Wonna concatenate numerous fields to obtain all values in a single cell? Here’s the script:

Sub ConcatenateAll()

Dim x As String, rng As Range, cel As Range, v_new As Integer, v_old As Integer

With ActiveSheet

Set rng = .Range("F2:F2736")

For Each cel In rng

v_new = Int(cel.Value)

If (v_new <> v_old) Then
x = x & "," & Int(cel.Value)
End If

v_old = v_new

Next

.Range("G2").Value = x

End With

End Sub

And in order to insert a little bit more complicated string in ArcGIS’s Field Calculator, you need to do this:

"<img src='http://localhost/graph.php?data=36,36,37," & Int([wohnfl_per]) & "' />"

ArcMap: Convert a value to NoData (IsNull)

Tuesday, August 24th, 2010

Easy, easy… In Spatial Analyst -> Raster Calculator do:

isnull([My Raster] <= 0, [My Raster])

ArcMap: Raster Data

Tuesday, August 17th, 2010

Just working with some extensive raster data sets. And running into a problem – that is, the values of the raster, although integer, are not being displayed. Here is a solution:

Use the “Build Raster Attribute Table”. And if an error is coming up concerning the reaching of a limit, then use the advanced settings utility has an option to set maximum number of attribute entries.
The utility should be in your install location in the Utilities folder (by default – C:\Program Files\ArcGIS\Utilities). Run the AdvancedArcMapSettings executable and select the Raster tab.

Debugging AJAX

Monday, August 16th, 2010

Need to debug AJAX? Beside some tips I found on the Net, here is one I found particularly useful, at least in my current case. Just use a

tail -f /private/var/log/apache2/access_log

Or

tail -f /private/var/log/apache2/error_log

which displays the latest log entries… which can help to solve some major issues.

Solartaxi

Monday, August 16th, 2010

Great project. Traveling around the world with solar energy. Wow!

Air Traffic Visualization

Sunday, August 15th, 2010

Great visualization of 24 hours of air traffic. Shows well, similar to the Nightlights of the Earth, which regions of the globe are not connected. Impressive!

Nightlights of the Earth

Sunday, August 15th, 2010

Population Distribution

Friday, August 13th, 2010

Attractive and interesting way to sum up the global population.

ArcGIS to SLD

Tuesday, August 3rd, 2010

Gush, sometimes feeling as we’re still living in the 80ies. How do you get data from ArcGIS to GeoServer, classes & colors including?! No easy task. Here is a small lib which makes the export from ArcGIS to SLD possible (with some additional explanations here). Thanks a lot!