The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B4. Beijing 2008
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Point-Selecting, Stone-burying, Observation, Calculation.
2.2.2.1.3 Four Class Level Observation
2.2.2.2 Photo Control Surveying
Photo control surveying mainly includes: photo control points
arrangement, numbering, punch points selecting, grooming,
surveying.
2.2.3 Aerotriangulation
All our indoor aerotriangulation is full digital
aerotriangulation. The full digital aerotriangulation provides
reliable high quality orientation points for field elevation points
surveying, plane points checking, aerotriangulation and data
collection.
2.2.4 Acquiring All Topographic Elements Data under Full
Digital Photogrammetry System
With Microstation software platform support, data collection
process is based on SSK,DMS,JX-4C full digital
photogrammetry workstations. Planimetric features acquiring
will be done based on models and according to the
corresponding elements classification rules, and then data files
will be generated in DGNYDWG format.
2.2.5 Field Investigation and Surveying, Supplement Surveying
Referring to collected data, we open paper map. According to
the corresponding project field technical specification and
denotation methods, in field spot, we define the attribute of the
features, acquire place names, and make supplement surveying
for hidden features as well as new features.
2.2.6 DLG Data Editting
In DLG data editing, on the basis of full digital collected
graphic data and according to the project plot specification, the
indoor operators do map grooming with the comparison to the
field investigation and surveying. The operators do some
processing work like topographic features grooming,
symbolization, building eaves correction, adding notes to layers
and structure attributes, road grades classification, vegetation
symbols filling, linear symbols designing, hues classification,
various name noting, attribute connection. Through this
processing, the beautiful map is achieved, which is ready for
database inputting.
need of DOM rectification, we shall generate a set of DEM data.
Therefore, through elements filtering and extraction, the real
land elements (breaklines, terrain characteristic) will be
extracted. Then, with certain calculation and interpolation,
DEM or DTM of various types and software formats will be
generated (Picture 5).
2.2.8 DOM Data Production
2.2.8.1 In Orthopro modules,according to DEM file we make
orthophoto rectification for the photos with defined exterior
elements.
2.2.8.2 With I/RASC, we check the rectified images.
2.2.8.3 We do color balance processing with professional color
balance software, to make the whole project area symmetrical
and consistent in color.
2.2.8.4 After color balance processing, we do image mosaic
with I/RASC.
2.2.8.5 In photoshop, we check and correct the images.
2.2.8.6 Uploading Vector Data
In digital orthophotomap delivery, besides image data, photo
frame, coordinates system, production unit, place name,
elevation information shall be delivered.
2.2.9 GIS Database Establishment
With information modernization improvement, clients become
very demanding. They do not only require graphic data for
urban or rural planning, engineering designing, but also require
GIS database for easy inquiry, analyzing, counting. For land
resources investigation projects, the clients’ demands on
database, which require beautiful plot effect and perfect
database, are particular high. From DGN via FME to
ARCGIS,MAPINFO, from DGN via DXF to MAPGIS,from
DGN via main procedure, ARSC’s database production mode
automaticly introduces CASS,KISS different conversion
schemes. These schemes are widely applied in various
surveying projects, such as Field Information Management
System, National Land Resources Information Management
System, and City Planning Information Management System.
(Picture 5)
3. THE CONCRETE APPLICATION CASES AND
ACHIEVEMENT
In view of the thesis length, the following cases are only from a
few recent years project achievements.
2.2.7 DEM Data Extraction
After full digital topographic map collection, in view of the