More Information

Help Document

Frequent Q & A

Data Description

Development Guide



























Please be patient while the applet is loading (Image courtesy of Space Imaging)

Web GeoViewer (Image Viewer 5.0) lets you:

Internet Mapping made easy

  • Live access raster and vector data
  • Interactive toggle multiple GIS layers on and off
  • Translucent filter layer for thematic mapping
  • Dynamic identify any geographic feature and place
  • Brush multiple objects on the fly
  • Select feature records in the table and highlight on the map
  • Direct search attribute value in the geodatabase
  • Fully Customizable map composition, legend color and text


Internet Imaging made simple

  • Multi-temporal image themes comparison with interactive blend/fade controls
  • Multi-linked overviewer and magnifier window with synchronized viewing
  • Info Panel with on-line help, text description and history record
  • Multiple image layers arrangement
  • Semantic zoom by rectangle, smooth pan and full extent functionality
  • Real-time zoom (Animated zooming) in fine detail
  • Area determination, perimeter calculation, and distance measurement
  • Dynamic buffering zone around geographic point, line and polygon
  • 3D rotated text label and image regional annotation
  • On-screen digitizing and boundary delineation
  • Geo-referenced Imagery with on-screen coordinate info display

General Information for Web GeoViewer (Image Viewer 5.0)

Open and reorder multi-temporal image themes (layers), date label is updated automatically

Click and hold down mouse to drag a rectangle box to zoom in the area of interest

Click and hold down mouse to drag a rectangle box to zoom out

Drag the mouse upper-right to zoom in, lower left to zoom out

Click and drag the mouse to pan the image

Click to fit the image on screen to full view

Click and open the set units dialog box, change the length and area units used for display.

Click to measure point position in the displayed image

Click to measure length and segments in the displayed image. Left click the mouse to add a point in the image, draw a line representing the distance you want to measure, right click and drag the mouse to move a point. The length is the accumulative distance of line segments.

Click to measure perimeters and areas in the displayed image. Left click mouse pointer on image to add a point. Continue clicking to outline area of interest. Right click and drag the mouse to move a point

Digitize geographic point, line or polygon you want to buffer around first (the more vertices, the better), then click the buffer and popup buffer dialog box, type the distance and select the units to create a buffer area around the feature, a buffer zone will be created at the distance you specified.

Click this icon to remove all digitized points, line, polygon or selected features on the image.

Click this icon and move the mouse pointer over a feature you want to identify. The features in any visible GIS layers under the pointer will be identified.

Select geographic features by dragging a rectangle around them, all visible GIS layers within the box will be highlighted. To deselect selected features, click or drag the mouse where there are no features.

Before you open a layer's attribute table, 1) Turn the layer check box on . 2) make the layer active (bevel border). 3) highlight the layer using select feature icon that you wish to see the attributes.

1. When you select feature records in a
attribute table, the feature highlights on the map

2. To select consecutive records in a table, click and drag the mouse up or down
3. Press and hold the Ctrl key while clicking additional records
4. Click
Ctrl+A to select all the records in the attribute table

Click to open a search dialog box. Type the attribute value of interest in the text field, and then click the find button to search for the attribute in geo-database. The found features will list in the results window and click to highlight features on the map.

Click the mouse pointer on the display where you want to add the text, a text dialog box will popup and type the text string in the text field, choose the font name, style, size, color, and rotation angle for the display.

Click to remove all the texts you added on the display

Turn the magnifier window 2X on and off, drag the window to see a magnified view of a small area without changing the extent of your view.

Turn on-screen coordinate display visible and invisible

Click to open the help document

Click the color button to change the GIS layer and legend color

Click the check box to turn the GIS layer on and off

Move left slider to blend/fade the middle image, right slider to blend/fade the top image. When the applet is initialized, move the right slider first instead of the left, because the top image covers the middle and bottom image.




If you find any bugs or want to contribute code to the Image Viewer or Web GeoViewer, please feel free to contact Liang Guo (

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