organisation | MLURI |
user_name | David Miller |
user_organisation | Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen AB15 8HQ |
date | 09/05/96 |
data_set_name | Cwm Berwyn DEM 1995 |
data_date | 1995 |
description | A digital elevation model (DEM) of the Cwm Berwyn study site derived by digital photogrammetry, in raster format at a resolution of 1m in X, Y and Z. The dataset is a mosaiced product from three stereo models. |
raster_vector | RASTER |
filename | Cb95_1mdem.img |
software | Erdas Imagine 8.2, Orthomax module (developed by Vision International, a division of Autometrics Inc.). |
formats | Erdas Imagine (.img), Erdas 7.5 (.lan), Arc Grid |
operating_system | UNIX Solaris |
format | Erdas Imagine (.img) |
projection | Projection: Ordnance Survey National Grid (Modified Transverse Mercator, scale factor 0.9996, false eastings -400000, false northings 100000, central meridian 2oW 49oN). |
data_quality | YES |
resolution | X: 1m; Y: 1m; X: 1m. |
attributes | Not Relevant |
methods | Ground observations made using a Global Positioning System, in differential mode using MIDAS software. Ground observations accurate to approximately +- 1m in X, Y and Z. Observations made on 1:10 000 maps. Accuracy estimated as RMS in X, Y: 1.1m. Accuracy of Z (dependant upon benchmark observations) approximately 0.25m. Observations made on the digitized aerial photographs for interior orientation: RMS 0.26 pixel. |
other | Full details of DEM accuracy available (currently on printed paper or postscript file). Photograph scale: 1:10 000; camera: Wild RC8, date of photography: 25th June 1995; Company: ADAS, Brooklands Avenue, Cambridge, CB2 2BL. Tel: 01223 455 780. Location Tywi Forest; Job Number 24/95; Film Number 650. OS 1:50 000 map number 147. Film colour negative. Colour prints were scanned by University of Joensuu, Finland. Contact Ari Talkkari. Scan resolution: 800 dpi. |
copyright | Photograph copyright with ADAS and Forestry Commission. DEM Copyright ASSUMED to be MLURI. |
contact | David Miller MLURI. Tel: +44 1224 318 611 Fax: +44 1224 311 556 Email: david@macaulay.ac.uk |