Fce 552 part6-3

Dept. of Geospatial & Space Technology

University of NairobiB. Sc. (Civil Engineering)

1.1. Concept of image interpretationConcept of image interpretation

2.2. Procedures of InterpretationProcedures of Interpretation

3.3. Interpretation ElementsInterpretation Elements

4.4. Interpretation KeysInterpretation Keys

5.5. Applications of Image Applications of Image

InterpretationInterpretation

FCE 552: Engineering Survey IV

Image Interpretation


University of NairobiEngineering Surveying IV

Concept of Image Concept of Image InterpretationInterpretation



University of NairobiEngineering Surveying IV


The Remote Sensing The Remote Sensing ProcessProcess


University of Nairobi


B. Sc. (Civil Engineering)

To extract qualitative and quantitative information To extract qualitative and quantitative information

from imagery about the from imagery about the shape, location, structure, shape, location, structure,

characteristics, quality, condition, relationshipcharacteristics, quality, condition, relationship of of

and between objects using human knowledge.and between objects using human knowledge.

Objective of Image Objective of Image InterpretationInterpretation





Information from Information from ImageryImagery





Human Interpretation vs Human Interpretation vs Computer based Computer based InterpretationInterpretation





Procedures of InterpretationProcedures of Interpretation





Procedures of Procedures of InterpretationInterpretation





Image Classification involves assigning all pixels in the Image Classification involves assigning all pixels in the

image to particular classes or themes (e.g., water, image to particular classes or themes (e.g., water,

coniferous forest, deciduous forest, coniferous forest, deciduous forest, maizemaize, wheat, etc.). , wheat, etc.).

The resulting classified image is comprised of a mosaic of The resulting classified image is comprised of a mosaic of

pixels, each of which belong to a particular theme, and is pixels, each of which belong to a particular theme, and is

essentially a thematic "map" of the original image.essentially a thematic "map" of the original image.

Image ClassificationImage Classification (1)(1)





Information Classes and Spectral ClassesInformation Classes and Spectral Classes::

Information classesInformation classes are those categories of interest that are those categories of interest that

the analyst is actually trying to identify in the imagery, the analyst is actually trying to identify in the imagery,

such as different kinds of crops, different forest types or such as different kinds of crops, different forest types or

tree species, different geologic units or rock types, etc. tree species, different geologic units or rock types, etc.

Spectral classesSpectral classes are groups of pixels that are uniform (or are groups of pixels that are uniform (or

near-similar) with respect to their brightness values in near-similar) with respect to their brightness values in

the different spectral channels of the data. the different spectral channels of the data.

The objective is to The objective is to matchmatch the spectral classes in the data the spectral classes in the data

to the information classes of interest. Rarely is there a to the information classes of interest. Rarely is there a

simple one-to one match between these two types of simple one-to one match between these two types of

classes. classes.

Image ClassificationImage Classification (2)(2)





Interpretation ElementsInterpretation Elements





Interpretation KeysInterpretation Keys





Elements of Tone/ColourElements of Tone/Colour





Elements of Size & Elements of Size & ShapeShape





Elements of TextureElements of Texture





Elements of PatternElements of Pattern





Elements of Height & Elements of Height & ShadowShadow





Elements of Associated Elements of Associated RelationshipsRelationships





Interpretation Keys for TreesInterpretation Keys for Trees





Applications of Image Applications of Image InterpretationInterpretation





Interpretation of Aster ImageInterpretation of Aster Image





Colour CompositionColour Composition





Image Interpretation – Land Image Interpretation – Land CoversCovers





Image Interpretation – FloodsImage Interpretation – Floods





Image Interpretation – WildlifeImage Interpretation – Wildlife





Image Interpretation – VolcanoImage Interpretation – Volcano





Image Interpretation – MineImage Interpretation – Mine





Image Interpretation – Image Interpretation – EnvironmentEnvironment





Image Interpretation – OceanImage Interpretation – Ocean

Fce 552 part6-3

Education

Transcript of Fce 552 part6-3