The GlobAEROSOL generates daily global aerosol maps for the period 1995-2007 by merging ATSR-2, AATSR, MERIS and SEVIRI satellite data. The products produced are aerosol optical depths at 0.55 and 0.87um and Angstrom coefficient and estimated speciation.
This dataset comprises the following product types:
ATSR-2 Orbit-based Pixel Counts. These are supplementary files generated for ATSR-2 alone, which contain the number of instrument pixels from each channel which were included in each retrieval grid cell. Individual-sensor Orbit-based Aerosol Products (IOAP). These files contain all the output of the individual sensor retrievals, with coverage corresponding to that of the original level 1 (radiance) data from the sensor.
Individual-sensor Global Aerosol Products (IGAP). These constitute bias-corrected daily maps of aerosol properties derived from each sensor, at a specific time of day. For ORAC retrievals results are only reported for the "best" aerosol type (and this type is identified). In all cases the IGAPs contain estimates of aerosol optical depth (AOD) at 550 nm and 865 nm and the Angstrom coefficient...
Full article and access the Global Aerosol Geodata
Showing posts with label geodata. Show all posts
Showing posts with label geodata. Show all posts
Tuesday, July 27, 2010
Global Soil Moisture Data from MetOp Satellites
Global, coarse-resolution soil moisture data (25-50 km) are derived from backscatter measurements acquired with scatterometers onboard the satellites ERS-1 and ERS-2 (1991 to present) and the three MetOp satellites (2006-2020). Two different product types are derived:
* Level 2 products representing the soil moisture content within a thin soil surface layer (< 2 cm) during the time of overflight of the satellite. * Level 3 products representing the water content in the soil profile, regularly sampled in space and time. The Level 2 surface soil moisture (SSM) data are derived using a change detection method that relies upon the multi-incidence observation capabilities of the ERS and METOP scatterometers to model the effects of vegetation phenology. The surface soil moisture values are scaled between 0 and 1, representing zero soil moisture and saturation respectively. Retrieval is not possible over tropical forest which affects about 6.5% of the land surface area.
Balance of Articles and access the MetOp Global Soil Moisture Geodata
* Level 2 products representing the soil moisture content within a thin soil surface layer (< 2 cm) during the time of overflight of the satellite. * Level 3 products representing the water content in the soil profile, regularly sampled in space and time. The Level 2 surface soil moisture (SSM) data are derived using a change detection method that relies upon the multi-incidence observation capabilities of the ERS and METOP scatterometers to model the effects of vegetation phenology. The surface soil moisture values are scaled between 0 and 1, representing zero soil moisture and saturation respectively. Retrieval is not possible over tropical forest which affects about 6.5% of the land surface area.
Balance of Articles and access the MetOp Global Soil Moisture Geodata
Saturday, June 19, 2010
Climate Change Global Warming Shapefiles - Changes in Temperature and Precipitation from 2010 through 2099
IPCC 4th Assessment scenario A2 temperature and precipitation GIS shapefile map layers for the years 2010, 2020, 2030, 2040, 2050, 2060, 2070, 2080, 2090 and 2099. The data points are spaced approximately 4.5 km (2.8 miles) apart. The data covers the lower 48 United States. Each point includes data for each of the 12 months of the year, making comparisons and calculations of increases or decreases between months and decades possible.
About the A2 Scenario
The A2 storyline and scenario family describes a very differentiated and heterogeneous world. The underlying theme is self-reliance and preservation of local identities. Emphasis on economic, social, and cultural interactions between regions is less than in other storylines. Fertility patterns across regions converge very slowly, which results in high population growth. Economic development is uneven, the income gap between now-industrialized and developing parts of the world does not narrow, and per capita economic growth and technological change are more fragmented and slower than in other storylines. Main characteristics A2 scenario include: high population growth, medium GDP growth, high energy use, medium-high land use changes, low resource (mainly oil and gas) availability, slow pace and direction of technological change favoring regional economic development.
In addition to each GIS shapefile map layer, you get base map layers including cities, roads, rivers, states and water bodies.
Download Climate Change Temperature and Precipitation GIS Shapefiles
About the A2 Scenario
The A2 storyline and scenario family describes a very differentiated and heterogeneous world. The underlying theme is self-reliance and preservation of local identities. Emphasis on economic, social, and cultural interactions between regions is less than in other storylines. Fertility patterns across regions converge very slowly, which results in high population growth. Economic development is uneven, the income gap between now-industrialized and developing parts of the world does not narrow, and per capita economic growth and technological change are more fragmented and slower than in other storylines. Main characteristics A2 scenario include: high population growth, medium GDP growth, high energy use, medium-high land use changes, low resource (mainly oil and gas) availability, slow pace and direction of technological change favoring regional economic development.
In addition to each GIS shapefile map layer, you get base map layers including cities, roads, rivers, states and water bodies.
Download Climate Change Temperature and Precipitation GIS Shapefiles
Saturday, March 27, 2010
GEODAS (GEOphysical DAta System) Software for Windows, Xwindows and Macintosh OS-X
National Geophysical Data Center's GEODAS (GEOphysical DAta System) data management system can be run in Microsoft Windows, UNIX Xwindows and Macintosh OS-X environments. GEODAS software accesses all GEODAS Databases, including Marine Trackline Geophysics, NOS Hydrographic Surveys, Coastal Relief Model, ETOPO2 Gridded Elevations and Great Lakes Bathymetry DVD sets.
MS Windows
MS Windows users will find GEODAS access software on all the GEODAS DVD sets as well as data downloaded from GEODAS On-line datbases. Click to obtain or update the GEODAS Software for On-line Downloads Ver 5.0.13 or the latest GEODAS 5.0 DVD Software Version 5.0.13. See readme.txt for install instructions.
You can download stand-alone (MS Windows) programs from the GEODAS suite. At this time these include GEODAS Coastline Extractor and GEODAS ReFormat.
A version of National Ocean Service's NADCON software, which transfers back and forth from NAD27/Old to NAD83 Horizontal Datums is also available. This program nadcon2.zip will work with the GEODAS ASCII HYD93 and Binary HYD93 Formats.
UNIX Xwindows
UNIX Xwindows users will find a version of the Xwindows GEODAS Software which covers GEODAS CD/DVD sets and/or GEODAS On-line Data Downloads in one installation, The XWindows software uses the Tcl/Tk User Interface. Users will need to have Tcl/Tk installed (most Xwindows systems already have it). Pre-built binaries for 32 bit Linux systems are included. All other system will need to build from source. If your system can run MS Windows, it is suggested that you use the MS Windows version of GEODAS (above). Download the latest GEODAS XWindows Software Version 5.0 for On-line Downloads and/or for Version 5.0 DVD sets. See readme.txt for install instructions.
Macintosh OS-X
Macintosh users with OS-X can run the GEODAS User Access Software for DVDs and for On-line downloaded data. Download the GEODAS for Macintosh OS-X Version 5.0.07 Software. (These binaries will not work with Intel processor machines. You will have to build from the included source.) If your system can run MS Windows, it is suggested that you use the MS Windows version of GEODAS (above). See readme.txt for install instructions.
GEODAS Coastlines
I Hope this proves to be useful for you. If you are new to GIS, check out the Learn2Map GIS Tutorial and Atlas. We have more free GIS software available and there is plenty of free data and shapefiles that will work with these programs. More to come!
Tuesday, March 23, 2010
Climate change and environmental data with Google Earth and Google Maps
Kings College London - Climate change and environmental data with Google Earth and Google Maps. The datasets are developed by members of the EMM Research Group acting as project lead or collaborator. These databases serve static or dynamically updated downloadable datasets for use in a variety of geo-spatial applications.
Much of the spatial data is visualised and downloadable through a Google Earth or Google Maps interface. Region-based network links are used so zoom in to your area of interest to visualise the data. Links are also provided for downloading the raw data in simple formats for use in GIS or remote sensing systems.
These are public domain environmental data aimed at improving the information (raw and visualised) available to the scientific and conservation communities. The data are freely accessible to all for non-commercial use.
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