Databases Reference
In-Depth Information
identifier, the type of geospatial object, the latitude, longitude, height, width,
resolution, timestamp (either image download time or last update time), and
the thematic link to the data set associated with the object. A geotemporal
object is specified with a geotemporal object expression
ge
that is a logical
expression of object attributes and their values.
Geospatial
objects
Image/Raster
Vector
Digital
El
Aerial
Satellite
Elevation
models
ti
Pit
Point
Li
Line
A
Area
ea
photos
Sate te
Images
Raw
Images
Raw
Processed
Processed
Images
Hillside
Slope
Oth
Orthophotos
h t
St
Streets
t
Pk
Park
Hillside
Slope
Parcels
Schools
Rivers
Census
track
Brownfields
Hyper-
NOAA
Hospitals
NOAA
Hyper
spectral
o
s
track
Composite
NDVI
SPOT
LANDSAT
Impervious
Impervious
Surface
IKONOS
AISA
ASTER
Fig. 2.
Geospatial Object Type Hierarchy
Geotemporal Permissions
The permissions on the geotemporal objects include viewing, copying and
maintenance modes. The viewing modes include permissions such as view,
view-thumbnail and view annotation, zoom-in, overlay, identify, animate and
fly-by. View allows a user to see an image object covering a certain geographic
area, zoom-in allows a user to view an image covering a certain geographic area
at a specific higher resolution level, overlay allows users to generate composite
images, where a composite image is constructed from multiple images by first
georegistering and then overlaying them one on top of another, identify allows
the user to view the tabular data linked to an image, animate allows a user to
obtain a time series of images and integrate them to show the changes in the
images, and fly-by allows a user to traverse from one location to another
