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Zorluk: ZorGIS and Remote Sensing Fundamentals

An environmental planning agency in Nigeria is designing a Geographic Information System (GIS) database to assess flood vulnerability in the Niger Delta. The analysis requires representing a continuous land elevation surface alongside discrete road networks. Furthermore, satellite imagery must be acquired during nighttime and heavy cloud cover conditions. Which of the following correctly identifies the appropriate GIS data model for the elevation surface and the sensor type required for imagery acquisition?

  1. The elevation surface is best represented using a raster data model of pixel grid cells, while data acquisition requires an active microwave sensor.Cevap
  2. B
    The elevation surface is best represented using a vector data model of points and lines, while data acquisition requires a passive optical sensor.
  3. C
    The elevation surface is best represented using a raster data model based on topological polygons, while data acquisition requires a passive thermal sensor.
  4. D
    The elevation surface is best represented using a vector data model of pixel grid cells, while data acquisition requires an active solar sensor.

Cevap

The elevation surface is best represented using a raster data model of pixel grid cells, while data acquisition requires an active microwave sensor.
The correct answer accurately pairs the raster data structure—which represents continuous surface variations via a grid of pixels—with active microwave remote sensing, which provides its own radiation source capable of penetrating atmospheric clouds and operating at night.

Adım Adım Çözüm

1
Analyze spatial data representation requirements
Continuous spatial phenomena like elevation surfaces (Digital Elevation Models) are continuously varying and best stored as grid cells in a raster data model, whereas discrete features like roads use vector geometry.
Raster grid structures assign an elevation value to every pixel across a continuous space.
2
Determine remote sensing atmospheric and temporal constraints
Active sensors generate their own electromagnetic radiation (e.g., microwave RADAR signals) which can penetrate cloud cover and operate independent of daylight.
Passive sensors rely on ambient sunlight or earth radiation, which cloud cover obstructs.
3
Combine data model and sensor requirements to select correct pairing
The correct combination is raster data model paired with an active microwave sensor.
This combination fulfills both continuous spatial modeling and all-weather day/night image capture.

Anahtar Kavram

GIS Raster vs Vector Data Models and Active vs Passive Remote Sensing Sensors
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Konular

GIS and Remote Sensing Fundamentals

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