GISCafe Weekly Review July 5th, 2012

Article source: ShareMap.org 

ShareMap is slowly phasing out from beta stage. Feature set is almost complete and dozens of maps created with ShareMap enriches multiple Wikipedia articles.

There are two major features introduced recently:

Map calibration:

OpenStreetMaps is enormous source for geospatial data. Implantation of import mechanism from OSM was one of first features of ShareMap. But sometimes OSM data is not enough, especially when we try to create historical map. For example if we want to create map of dismantled tramway system in Cleveland we cannot find information about track position at OSM. But we can reuse pre war map of system (with expired copyrights, so it is 100% comply with Creative Commons license). We can treat this old map as overlay to our interactive map, but first of all we have to calibrate it. In simple words calibration is just selecting of several calibration points on raster map (old one) and interactive map. After point selection system warps. Under the hood well known open source GDAL library is used. In this video map calibration process is described in detail:

 

Google Maps has made available Google Map Maker for South Africa and Egypt.

In a webcast presented by Carahsoft, Intermap representatives talked about the fact that they have “the world’s largest 3D terrain database with the one meter LE 90 accuracy and consistency.” LE 90 is a linear air of 90 percent, and is commonly used for quoting and validating DEMs. LE 90 value represents the linear vertical distance of  90 percent of control points, and the respective twin matching counterparts acquired in an independent geodetic survey should be found from each other. For the U.S., which most on this call is interested in, Intermap has mapped the entire lower 48 plus some of Alaska.

Geofeedia offers geo search of social media
July 3, 2012  by Susan Smith

 

The young company Geofeedia offers aggregating capabilities of a new kind – assembling data from various social media sources such as Instagram, Twitter, Picassa and others – representing that data on a nice visual map with pins. Each source has a specific pin so that users can see the source and location of the data.

Geofeedia aggregates data from various social media sources such as Instagram, Twitter, Picassa and others - representing that data on a nice visual map with pins. Each source has a specific pin so that users can see the source and location of the data.

Colorado forest fires / Photo interpretation
June 29, 2012  by Sanjay Gangal

This image, captured by the Pléiades 1A satellite, shows the area of Colorado affected by forest fires, enhanced with additional information by Astrium Services’ geo-experts. The images from the Earth observation satellites operated by Astrium Services (Pléiades, SPOT, etc) are often used to support homeland security and emergency services personnel following a disaster.

Launched in December 2011, Pléiades 1A generates 50cm resolution imagery, following resampling, which is used for precision mapping and photo analysis.

Colorado Forest Fires, June 2012 - Copyright CNES 2012 - Distribution Astrium Services / Spot Image

Aerial View of Dutch History Brought to Life Through ERDAS APOLLO
June 29, 2012  by Mladen Stojic, President of Hexagon Geospatial

 

Most nations warehouse a treasure trove of historic aerial photography and maps that provide the foundation for tracking significant changes over time.   In addition to providing a historical perspective on land and development changes, this data is also very relevant for citizens who want to see how their places of residence have changed over time.

In the Netherlands, Dotka Data maintains a large and growing collection of historical aerial photography and maps, reflecting more than 200 years of history.  The collection includes topographic maps from as far back as 1798, and aerial photographs taken for topological purposes from 1932 to current day.

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