How To: Use the Java Connector to Project Data

Summary

Instructions provided describe how to use the Java Connector to Project Data. Below you a sample JSP code can be obtained that demonstrates the methods required to perform map projection on-the-fly using the ArcIMS Java Connector.

Procedure

Install and configure the ArcIMS JSP samples.

Note:
See the Related Information section below for instructions on setting up the ArcIMS JSP samples.

Add the current projection information to the map configuation AXL file.

This example uses the SantaClara map service based upon the SantaClara.axl file. The SantaClara data is in Geographic coordinate system. Add the following AXL to the PROPERTIES element located at //ARCXML/CONFIG/MAP/.
```
<FEATURECOORDSYS id="4326" />
<FILTERCOORDSYS id="4326" />
```
Furthermore, ArcIMS only projects layers that have projection information defined for them. By default, only the 'streams' layer in the SantaClara service has projection information defined, with a .prj file. The code below projects the map, but only the 'streams' layer appears in the projected image. While this is enough to demonstrate the concept of projecting data on the fly, it is necessary to add a COORDSYS element to each LAYER to view that layer in this sample.

Example:
```
<LAYER type="featureclass" name="tract" visible="true" id="1">
  <DATASET name="sc_tract" type="polygon" workspace="shp_ws-0"/>
    <COORDSYS id="4326"/>
```
See the ArcXML Programmer's reference help for the element COORDSYS for additional information and additional Projection IDs available.

Create a JSP page named 'ProjectionTest.jsp' using the code given below and run it in a similar manner from jspsamples folder.

<%@ page import="com.esri.aims.mtier.io.*, com.esri.aims.mtier.model.map.layer.FeatureLayer, java.lang.Integer" %>

<jsp:useBean id="connection" class="com.esri.aims.mtier.io.ConnectionProxy" scope="session" />
<jsp:useBean id="map" class="com.esri.aims.mtier.model.map.Map" scope="session" />

<%
//initialize the connection
if (connection.getHost() == null){
connection.setHost("localhost");
connection.setPort(5300);
connection.setService("SantaClara");
connection.setDisplayMessages(true);
map.initMap(connection, 0, true, true, true, true);
map.setWidth(500);
map.setHeight(350);

}
int proj = 0;
long projId = 0;
if(request.getParameter("isProject") != null){
proj = Integer.parseInt(request.getParameter("isProject"));
}

if(request.getParameter("projId") != null){
projId = Long.parseLong(request.getParameter("projId"));
}

if(proj == 1 && projId != 0) {

// get the current coordinate system
com.esri.aims.mtier.model.map.projection.FeatureCoordSys oldFeatCS = map.getFeatureCoordSys();
long oldID = -1;
if(oldFeatCS != null) oldID= oldFeatCS.getID();
if (oldID == -1) oldID = map.getInitialFeatureCoordSys().getID();
com.esri.aims.mtier.model.map.projection.FeatureCoordSys featCS = new com.esri.aims.mtier.model.map.projection.FeatureCoordSys();
featCS.setID(projId);
com.esri.aims.mtier.model.map.projection.FilterCoordSys filterCS = new com.esri.aims.mtier.model.map.projection.FilterCoordSys();

if (oldID != projId) {
filterCS.setID(oldID);
map.setFeatureCoordSys(featCS);
map.setFilterCoordSys(filterCS);
map.refresh();
}

filterCS.setID(projId);
}

map.refresh();

com.esri.aims.mtier.model.envelope.Envelope env = map.getEnvelope();
double minx = env.getMinX();
double miny = env.getMinY();
double maxx = env.getMaxX();
double maxy = env.getMaxY();
%>

<html>
<head><title>ArcIMS JSP Samples</title></head>

<script language="javascript">
function reProject(){
document.Main.isProject.value="1";
document.Main.submit();
}
</script>

<BODY>

<form action="ProjectionTest.jsp" name="Main" id="Main">
<input type="hidden" name="isProject" value="0">

<table border="1" bgcolor="ffb900" cellpadding="10" width="500" align="center">

<tr>
<td colspan="2">
<img src="<%= map.getMapOutput().getURL() %>">
</td>
</tr>

<tr><td colspan=4 align=center>
Current Envelope Extents<br>
<table border=1>
<tr><td width=30></td><td width=30><%=maxy%></td><td width=30></td></tr>
<tr><td><%=minx%></td><td></td><td><%=maxx%></td></tr>
<tr><td></td><td><%=miny%></td><td></td></tr>
</table>
</td></tr>

<tr>
<td>
Projection Id�<input type=text name="projId" value="<%if (projId == 0) out.print(4326); else out.print(projId);;%>" size=8>
<input type="button" name="Project" value="Project" onClick="reProject();">

<br><br>
Sample Projection Ids
<br><br>

ArcIMS 4.0.1
<br><b>4326</b>��(GCS_WGS_1984)
<br><b>26743</b>��(NAD_1927_StatePlane_California_III_FIPS_0403)

<br><br>

ArcIMS 9.0
<br><b>4326</b>��(GCS_WGS_1984)
<br><b>2227</b>��(NAD_1927_StatePlane_California_III_FIPS_0403)

</td>
</tr>

</table>
</form>

</BODY>
</HTML>

Article ID:000006720

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Set up ArcIMS Java Connector and JSP samples

Use the Java Connector to project data

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