International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004
For the strips it is also available entering terrain height
automatically. By using appropriate DTED (digital terrain
elevation data), flight heights can be calculated automatically.
For this process, window shown in figure 3 is used.
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Figure 3. Terrain height window
In this step average terrain height of each strip is calculated
from DTED. In the figure average terrain height along the
strip, minimum and maximum limits for laps and scale are
seen and edited manually or by selecting automatic mode, flight
height for all strips in the project are calculated.
Additionally to these tools, some extra tools can be used for
utilities. The utility tools that can be used while planning are;
l. Customize the project: Line thickness, display color for
strips, single photos, control points etc.
Zooming process: All, in, out and pan
Add base map: Vector (CAD format), Raster (tiff, jpeg,
bmp, MrSid, etc.)
Edit base map option: show, remove, color, thickness,
fill, find etc.
Measure: Length or area
Add project area by drawing
Export plan to image format: tiff, jpeg, bmp etc.
Print plan with project information
Create report of plan in text format: Project
information, coordinates etc.
10. See coverage of each strip or coverage of photo in a
strip
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After preparing plan,.a plan diskette is prepared for flight. In
this diskette, there is all project information necessary for flight
mission. With the aid of GPS and computer in the plane, the
flight is performed as it is planed and as it is desired. During the
flight mission, coordinates of camera exposure stations are
determined. After the flight, coordinates of camera exposure
stations and after flight information are stored in the plan
diskette.
By using after flight information diskette with the software, all
information about flight mission can be obtained. It is also
possible to edit and plot. Some of the tools for this purpose are;
1. Import after flight report
2.. Plot
3. Edit: Name format of exposure station, display color,
line thickness etc.
4. Check exposures
5. Remove unused exposures
6. Setstarting number for photos.
7. Prepare report
8. Print
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9. Compare pre and after flight coordinates of each photo
10. Create photogrammetric blocks
2. PRESENTING OF DIGITAL ORTHOPHOTOS
2.1 Introduction
Presenting a product is final process for a project. The success
of a project is mostly depends on presentation success of it.
Especially the digital products have much more change
according to hardcopy products.
In photogrammetry the digital products have become very
popular due to their diverse of use. Applications in many
disciplines integrate the existing line data with the digital
images. One useful and very common integration is that the
orthophotos. Orthophoto is a planimetrically correct orthoimage
on which measurements of terrain geographic location,
distances, angles, and area can be made. On an unrectified
imagery, such measurements can only be approximated due to
relief and image displacements. Digital orthophotos have quite
advantageous for providing a base for a new data set or for
updating existing databases. The other significant advantage of
digital orthophotos is that they provide a more readily usable
data source for a GIS when compared with conventional data
sources.
Various computer software packages now make it possible to
presenting digital products. Once very expensive and
complicated, some of these commercial packages are
surprisingly affordable, run on standard desktop computers, and
require minimal training to use. Here we developed software to
serve these kinds of jobs. This software is developed according
to request of our users, so they are much more useful for
internal purposes then the other commercial ones.
The other software is presentation of digital orthophotos with
user friendly interface. The purpose of the system is to reduce
costs of printing and to present the products to users as soon as
possible. This software has ability of presenting place names
and vector data on a digital orthophoto. Tools on the software
arc; zooming, adding or editing place names or coordinates,
measuring length or area, printing image with or without data in
scale, exporting images into other formats, adding or editing
vector data
2.2 Software for Presenting Digital Orthophotos
This software is developed according to request of our users.
The software is formed with many useful tools for users. It is
easy to use and it can be easily adapted to new conditions.
Presenting digital orthophotos have three parts. First part is
software. Second part is digital orthophoto and the last one is
database. All these three parts are set in one CD-ROM. Users
can easily setup the programme and run it. When a new version
of one of these data is produced, it can be easily replaced by
new one. Users also have an opportunity to add or edit
database. The software has a starting window shown in figure 4.
This window allows selecting digital image and related
database.
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