Wednesday, July 28, 2010

Geographic Geospatial Download: DEM, DLG, LULC

Download Digital Elevation Model (DEM), Digital Line Graph (DLG) and Land Use Land Cover (LULC) USGS Geospatial Data.

1:250,000 & 1:100,000 Scale Land Use Land Cover (LULC)

USGS LULC download

Article and Access to Geodata downloads

Tuesday, July 27, 2010

Global Aerosol from Earth Observation (GlobAerosol) Geodata Maps

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

The Ionia website provides access to a number of Earth Observation Level 3 and Level 4 productsThe Ionia website provides access to a number of Earth Observation Level 3 and Level 4 products

The Ionia website provides access to a number of Earth Observation Level 3 and Level 4 products generated by ESA projects, using a variety of instruments, including non-ESA satellite data.

Earth Observation Satellite Data

These products have been generated mostly as a result of projects run through the ESA Data User Programme (DUP) and Data User Element (DUE). In addition, some products were generated through ESA internal projects. This is the case in particular of the ATSR fire atlas products.

Why this name?

Read balance of article and access the IONA satellite data

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:

ERS / MetOp Soil Moisture

* 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