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Natural Resources Canada > Earth Sciences Sector > Priorities > Canada Centre for Remote Sensing
Tour Canada from space Trepassey, Newfoundland
 This Landsat TM image covers a portion of the southern shore of the Avalon Peninsula in Newfoundland. The soils are very thin in this area, and generally support only sparse vegetation cover. The colour combination shown here presents mature forest in dark brown, rock outcrops in pale green, and bogs in various shades of grey. The lakes and the Atlantic Ocean are depicted in black and several small clouds appear in white. The small community of Trepassey is just visible in one of the small ocean coves.
Question: Why are there areas of light blue along the ocean shore? [ Answer ]
About this Image
| Location: |
Trepassey, Newfoundland |
| NTS map(s): |
1K/11, 1K/14 (1:50,000) |
 Location Map: |
See a detailed map (1:1M) of the region |
| Image Date: |
August 31, 1992 |
| Satellites/Sensors: |
Landsat Thematic Mapper (TM) |
| Resolution: |
30 m pixels |
| Image Area: |
21km x 21km |
| Image Features: |
Bog, forest, wetlands, scrub, rock crops, shoreline, roads, power line |
| Related Tour Images: |
Whiteshell Provincial Park, Manitoba, near Ontario; Liard River Valley, Yukon |
| Related Glossary Terms: |
These terms from the CCRS Glossary may help you to understand this image and its interpretation:
false colour, false colour composite, plant reflectance, vegetation index, image texture, tone, brightness |
| Related Tutorial Sections: |
These sections of the "Fundamentals of Remote Sensing" tutorial by CCRS will help you to better understand this image and its interpretation:
2.8 2.12 4.2 4.3 5.3 5.7
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| Image Credits: |
Received by the Canada Centre for Remote Sensing
Processed by and provided courtesy of RADARSAT International Inc. |
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Additional
Information: | Landsat imagery is a valuable aid in determining land cover, identifying various
types of wildlife habitat, assisting in environmental impact studies, and locating
engineering materials, such as sand and gravel. It is often used by resource
management companies, utility companies and governments to plan routes for new
infrastructures like roads, pipelines and transmission lines. |
| Question: |
Why are there areas of light blue along the ocean shore? |
| Answer: |
In the image shown here, the blue colour is assigned to TM band 3, in the visisble part of the spectrum, while the red and green colours show bands 4 and 5, respectively, both of which are sensitive in the infrared, and thus provided more information about materials near the surface of the water. The blue areas are shallow waters, with the light reflecting from rock and sand on the bottom. Some suspended sediment in the water may also contribute to the light blue tint. |
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