Geoinformatics - Quick Revision Sheet
Quick revision
Key terms
| Term | Meaning |
|---|---|
| Scattering | Re-direction of radiation by particles or gas molecules |
| Absorption | Uptake of radiation by gas molecules in certain bands |
| Orbit | Closed path of a satellite around the earth |
| Geosynchronous | Orbital period matches the earth's rotation |
| Bathymetry | Measurement of the depth of water in water bodies |
| Digitization | Converting paper maps into numerical digits |
| Meta data | Data about the data |
| Photogrammetry | Photography used in surveying and mapping to ascertain measurements |
| Transponder | Receives a radio signal and transmits a different one |
Dates and numbers
| Fact | Value |
|---|---|
| First aerial photograph (Nadar) | 1858 |
| First balloon aerial images | 1859 |
| APPLE launched | 19 June 1981 |
| Kalamsat flown | 22 June 2017, 64 grams |
| GPS satellites | 24 |
| Galileo satellites | 30 (24 + 6 spare) |
| IRNSS service area | 1,500 km beyond India |
| Geostationary coverage | 70 degrees N to 70 degrees S |
GNSS and countries
GPS - USA; GLONASS - Russia; Galileo - European Union; BeiDou - China; QZSS - Japan; IRNSS - India.
More for this chapter
Book Back Questions9 textbook MCQs · solved
Additional MCQs20 extra MCQs · solved
Practice TestInteractive · instant score
Book Back TestTest yourself on the textbook set
Additional MCQ TestTest yourself on the extra set
Study NotesConcepts & methods
More chapters in Geography
View all
1 Population Geography
2 Human Settlements
3 Resources
4 Economic Activities
5 Cultural and Political Geography
7 Sustainable Development
8 Man-Made Disasters - Public Awareness for Disaster Risk Reduction
9 Surveying
10 Map Projection
11 Thematic Mapping
12 Representation of Geographical Data
13 Statistical Techniques