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Havsis- och snöinformation ur datorbearbetade satellitdata. En metodstudie
SMHI.
SMHI.
1979 (Swedish)Report (Other academic)Alternative title
Sea ice and snow information from digital processed sattellitdata - A Feasibility study (English)
Abstract [sv]

Programvara har utvecklats för en datoriserad bearbetning av NOAA VHRR data. Den omfattar geometriska korrektioner, presentation av kalibreringsdata, derivering av data, gråtonsförskjutning, olika presentationssätt etc. En SAAB D23 har använts för beräkningarna. Radskrivare har för det mesta använts för presentation av data, men också elektrostatisk rasterplotter och bläckstråleskrivare har nyttjats. De analoga VHRR data har digitaliserats vid FOA (Försvarets Forskningsanstalt).

Programvaran har huvudsakligen applicerats på havsis- och snöstudier. Men ytvattentemperaturer och en förmodad oljefläck vid Bravoplattformen i Ekofiskområdet har också studerats.

Digitalt bearbetade satellitdata är mer användbara än fotografiska bilder vid snö- och iskartläggning. En kvantifiering av snötäckningsgrad och vissa isparametrar är möjlig, men för många ändamål är en multispektral bearbetning nödvändig för att undvika falsk information.

En kort isstudie med datorbearbetade LANDSAT-data har också utförts. Programvaran har utvecklats vid FOA.

Abstract [en]

Computer programs have been developed for handling of NOAA VHRR digital data. The programs include geometric corrections, presentation of calibration data, derivation of data, variation of grey scales, different presentationforms etc. A SAAB D23 computer has been used for the computations. Line printer has mostly been used for presentation of data, but also electrostatic plotter and inkjet plotter have been used. The analogue VHRR data was digitizedat the Swedish Defense Research Board.

The software has mainly been applied to sea ice and snow studies but also in a less degree to studies of sea surface temperature and examination of data, which was supposed to be the oil spill at platform Bravo in the Ekofisk area.

Digital processed satellite data are more useful than photographic pictures both for sea ice and snow mapping. Quantification of snow cover and some ice parameters is possible, but for many purposes a multispectral data analysis is necessary in order to avoid false information.

A short sea ice study with computer processed LANDSAT data has also been carried out. The soft ware used was developed at the Swedish Defense Research Board.

Place, publisher, year, edition, pages
1979. , p. 120
Series
RHO, Hydrology and Oceanography, ISSN 0347-7827 ; 18
National Category
Oceanography, Hydrology and Water Resources
Research subject
Hydrology; Oceanography
Identifiers
URN: urn:nbn:se:smhi:diva-5828OAI: oai:DiVA.org:smhi-5828DiVA, id: diva2:1459968
Available from: 2020-08-21 Created: 2020-08-21 Last updated: 2020-08-21Bibliographically approved

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Havsis- och snöinformation ur datorbearbetade satellitdata. En metodstudie(3461 kB)55 downloads
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