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Posts treating: "data"

Sunday, 12 January 2020

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OSM, PostGIS and Docker: an approach for automatic processing 

Digital Geography [2020-01-12 22:31:26]  recommend  recommend this post  (449 visits) info
In the summer of 2019 Michael Marz started to extract most important items from OpenStreetMap and published those extracts as geopackages on his webpage. Back then I looked… The post OSM, PostGIS and Docker: an approach for automatic processing appeared first on Digital Geography.

GDEM V3 vs SRTM 1: a comparison 

Digital Geography [2019-08-11 19:41:14]  recommend  recommend this post  (97 visits) info
Some time has past since I last wrote a DEM comparison, comparing ALOS World with SRTM 1 and GDEM V2 with SRTM 3. But as NASA and METI released the lates version of the ASTER GDEM dataset, I will compare this once again for a certain area in central Mongolia. But this time, the competitor will be SRTM 1. GDEM V3 The announcement is quite promising: Compared to Version 2, Version 3 has a decrease in elevation void area due to the increase of ASTER stereo image data and improved process, and a [...]

GDEM V3 vs SRTM 1: a comparison 

Digital Geography [2019-08-11 19:41:14]  recommend  recommend this post  (90 visits) info
Some time has past since I last wrote a DEM comparison, comparing ALOS World with SRTM 1 and GDEM V2 with SRTM 3. But as NASA and METI released the lates version of the ASTER GDEM dataset, I will compare this once again for a certain area in central Mongolia. But this time, the competitor will be SRTM 1. GDEM V3 The announcement is quite promising: Compared to Version 2, Version 3 has a decrease in elevation void area due to the increase of ASTER stereo image data and improved process, and a [...]

Geocoding with Microsoft’s Azure Maps 

Digital Geography [2019-05-15 23:15:43]  recommend  recommend this post  (248 visits) info
API’s are getting more and more important as some (maybe the majority?) of GIS users don’t want to handle large datasets, don’t want to care about addresses and geo-coordinates, don’t want to create an own routing algorithm… As most of you might use Google, OSM or HERE for geocoding purposes I would like to introduce Azure Maps for this as well. Azure Maps We need to admit: No one is using Bing, am I right? No, seriously: Microsoft definitely missed the cloud computing and mapping [...]

A Digital Earth: the Potential of Data Brokers 

Digital Geography [2017-08-25 15:14:53]  recommend  recommend this post  (198 visits) info
Introduction In my previous two posts I introduced the Cloud based data broker technology, ERDDAP and demonstrated how one can use it to obtain a geo-spatial scientific data: Access sensor data on an buoy located in the Irish Sea . Get and display weather forecast data from the Global Forecast System (GFS). The use of data brokers to unify data catalogues is an approach taken by both the National Oceanic and Atmospheric Administration of the USA (ERDDAP) and the intergovernmental Group on [...]

Short Announcement: New Sentinel Cloudless Atlas 

Digital Geography [2017-08-25 10:05:52]  recommend  recommend this post  (232 visits) info
Mapbox created a cloudless Landsat map in 2013. That was a huge step for all the webmapping enthusiasts as we got a composit image of the world with stunning ground resolution and still cloudless! Now EOX, a company based in Vienna, provided a similar product called Sentinel Cloudless. And it is “for free”. The Sentinel Cloudless Map At the very moment the map is shipped as WMTS and WMS service in both: 4326 and 3857. As Klas already described on his post, the 4326 dataset performs a bit [...]

Free World DEM Data, 3D in your Computer 

Grindgis [2017-03-15 04:36:33]  recommend  recommend this post  (185 visits) info
Digital Elevation Model (DEM) is a raster image that holds z values, it is used widely during the analysis process where surface height value are important. As everybody is aware that Z or elevation values are expensive to obtain, so I have listed few places on internet where you can download the world DEM

ALOS World 3D V1.1 vs. SRTM1 

Digital Geography [2017-03-10 15:11:44]  recommend  recommend this post  (111 visits) info
Some days ago a new version of the ALOS 30m DEM was released: Void pixels due to clouds and snow pixels within 60 deg. of north and south latitudes in Version 1 were complemented by existing DEMs. Out of the areas are same with Version 1 product. As we already compared ALOS with SRTM-1(I saw the ALOS DEM as “the winner”) I am now interested in how this performs in a another setting. We are changing our focus from Mongolia to Germany and check how the new ALOS DEM works compared with SRTM [...]

Observing deforestation with Sentinel-1 

Digital Geography [2016-11-22 19:58:33]  recommend  recommend this post  (57 visits) info
While preparing for an upcoming presentation at the annual meeting of the American Geophysical Union (AGU) I came across a topic that I thought might make an interesting blog post.  The presentation is about using data from the Sentinel-1 mission for Earth Science applications.  The Sentinel-1 spacecraft are C-band SAR systems launched and operated by the European Space Agency (ESA).  An innovative aspect of this mission is that the collection scenario devised by ESA is systematic and very [...]

Do you need open data? Ask for it. 

Digital Geography [2016-11-09 17:15:15]  recommend  recommend this post  (70 visits) info
The well-known Q/A-forum StackExchange has started a new “Open Data” section. Users can ask for needed datasets and get feedback from the great StackExchange community. Especially for our GIS and webmapping readers this is good news. Often the methodology isn’t the core problem of dealing with scientific or business issues. Often it’s more or less a lack of proper open datasets to run visualization and analyses. The big advantage of StackExchange is their community with more than 5 [...]

The Geoscience Papers of the Future: a modern publication strategy for data management and scientific publication 

Geospace [2016-08-04 20:31:45]  recommend  recommend this post  (625 visits) info
Many data used in scientific papers are not accessible by reading the papers, which makes it difficult to understand and reuse. To effectively communicate data results and preserve observations, simulations, and predictions, the Geoscience Papers of the Future was launched in

Predicting the export and fate of global ocean net primary production: The EXPORTS 

AGU Meetings [2016-07-20 16:56:31]  recommend  recommend this post  (164 visits) info
Earth’s carbon cycle is heavily influenced by ecological processes in the ocean. The quantification and understanding of the intricate relationships between carbon dioxide and ocean ecosystems, EXPORTS and what effects these have on the present and future conditions on Earth, is one of the greatest challenges in oceanography. One of the most important aspects that preclude the full understanding of the ocean carbon cycle is the lack of parallel measurements at a global scale; this also [...]

Meeting report: 2016 EarthCube All Hands Meeting 

AGU Meetings [2016-07-19 20:40:28]  recommend  recommend this post  (114 visits) info
More than 130 geoscientists and cyberinfrastructure researchers beat the early June heat wave in Denver by spending their time planning the next stages of the National Science Foundation’s (NSF) EarthCube e-infrastructure project. Attendees of the third annual All Hands Meeting (AHM) represented major geoscience data facilities, hardware and software developers and scientists interested in the digital tools being developed. This year’s AHM marked an important milestone in the EarthCube [...]

Accessing Landsat and Sentinel-2 on Amazon Web services 

Digital Geography [2016-06-28 11:19:51]  recommend  1 recommendations  (215 visits) info
The cloud has made it easier to process large amount of data, and satellite imagery processing benefits from cloud processing too. One of the cloud services that offers access to satellite images, and abilities to process them in the cloud – no more need to download it to your computer and process it there – is Amazon Web Services. If you’ve never worked with cloud processing, getting started with AWS can be a bit daunting. This tutorial gives beginners an introduction to [...]

Can a commons design-pattern lexicon show open-science to its destination? 

AGU Meetings [2016-06-23 21:30:35]  recommend  recommend this post  (135 visits) info
After more than a decade of discussion and argument, the international open-science effort is looking for a roadmap to that single destination where it can consolidate its gains and allow science to reboot itself as entirely open. Several groups are calling for an integrative scholarly commons, where open-science objects—from ideas to published results—can be grown, shared, curated, and mined for new

Nepal Earthquake Aftermath- What Is Happening Underneath Kathmandu? 

Reporting on a Revolution [2016-06-20 11:41:00]  recommend  recommend this post  (126 visits) info

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We continue to learn more about the buildup and release of strain along the master detachment fault underneath the Himalaya. The master detachment fault known as the Main Himalayan Thrust is the surface along which the Indian plate is sliding underneath Asia. This data using GPS records of surface motion in the area affected by the 2015 Gorkha (Nepal) earthquake: Himalayan strain

Looking at Land Use and Informal Settlement in Dar es Salaam 

AGU Meetings [2016-06-06 19:40:54]  recommend  recommend this post  (178 visits) info

 TZ
A new data set from the Urban Spatial Data Collection of the NASA Socioeconomic Data and Application Center (SEDAC) operated by the Center for International Earth Science Information Network (CIESIN) depicts urban land use and informal settlements for the years 1982, 1992, 1998 and 2002 in the city of Dar es Salaam,

Using Sentinel-2 for crop monitoring 

Digital Geography [2016-06-02 12:30:55]  recommend  recommend this post  (280 visits) info
Sentinel-2 is the optical satellite of the Copernicus programme. It can be compared to Landsat, although it has a better resolution, of 10 to 20 meters. We’ll be using it for crop monitoring with simple vegetation indices. Overview Sentinel-2 is the high-resolution optical satellite of ESA and the EU. The images have a resolution of 10 to 20 meters, higher than Landsat, and, as always with the Copernicus programme, the data are free and open. In this tutorial, we’ll download an [...]

GeoDeepDive: Bringing dark data to light 

AGU Meetings [2016-05-31 23:44:37]  recommend  recommend this post  (181 visits) info
While the internet provides easier access to documents, it does not help manage the millions of publications that are accessible online. Global scientific literature is published so quickly that it is impossible for any one scientist to keep up. This is where GeoDeepDive, an National Science Foundation-funded EarthCube project, can

Flyover Country—The next generation field-based research tool 

AGU Meetings [2016-05-25 23:38:40]  recommend  recommend this post  (136 visits) info

 SE,US
In December 2015, with the support of a National Science Foundation (NSF) EAGER grant, the Flyover Country (FC) team of Amy Myrbo (University of Minnesota Research Associate), Shane Loeffler (2015 B.S. graduate of the University of Minnesota Duluth), Reed McEwan (University of Minnesota M.S. in Geology and Software Engineering) and Sijia Ai (University of Minnesota), launched FC as a geosciences mobile app for air travelers, road warriors and
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