The IDWR download
tool comes as a ZIP file that includes instructions for
installing the code. This Zip file provides the components
and instructions necessary to enable your application to do
the following:
- create
a pop-up menu allowing the user to select the layers to
download;
- clip
the shape-files and the images for the selected region;
- put
all of the clipped layers in a zip-file;
- deliver
the zip-file to the user.
The
image-clipping tool does not deliver a clipped image that is
the same size as the screen image. Rather, the tool
determines the dimensions of the clipped image from the
map coordinates of the region chosen by the user, and
delivers the clipped image at the full, original resolution.
The number of map-units per pixel (e.g. pixel size in
meters) must be specified for each image layer in
ArcIMSparam.js script.
The clipped
and downloaded image will be of the type delivered by the
map service: either a JPG, a GIF, or a PNG. Therefore, it
may be slightly degraded if the original image is a TIF.
The ArcIMS extract server is used to clip and extract the
non-image layers. Any combination of shapes and images
may be requested at one time.
The download software uses
two active server pages to monitor the production of the
images and zip-file. The download will not work under
Unix unless the Internet server can process ASP, which
requires a proprietary software package. |
