| 1186 |
The following types of projections are directly support by |
The following types of projections are directly support by |
| 1187 |
Thuban. The specific values for each are provided by the user |
Thuban. The specific values for each are provided by the user |
| 1188 |
to create custom projections. Thuban comes with predefined |
to create custom projections. Thuban comes with predefined |
| 1189 |
projections and are available through the Projections dialog. |
projections which are available through the Projections dialog. |
| 1190 |
</para> |
</para> |
| 1191 |
<variablelist> |
<variablelist> |
| 1192 |
<varlistentry> |
<varlistentry> |
| 1193 |
<term>Geographic</term> |
<term>Geographic</term> |
| 1194 |
<listitem><para></para></listitem> |
<listitem><para><literal>Ellipsoid</literal></para> |
| 1195 |
|
<para><literal>Source Data</literal>: either Degrees or Radians |
| 1196 |
|
</para></listitem> |
| 1197 |
</varlistentry> |
</varlistentry> |
| 1198 |
<varlistentry> |
<varlistentry> |
| 1199 |
<term>Lambert Conic Conformal</term> |
<term>Lambert Conic Conformal</term> |
| 1200 |
<listitem><para></para></listitem> |
<listitem><para><literal>Ellipsoid</literal></para> |
| 1201 |
|
<para><literal>Latitude of 1st standard parallel</literal></para> |
| 1202 |
|
<para><literal>Latitude of 2nd standard parallel</literal></para> |
| 1203 |
|
<para><literal>Central Meridian</literal></para> |
| 1204 |
|
<para><literal>Latitude of Origin</literal></para> |
| 1205 |
|
<para><literal>False Easting</literal> (meters)</para> |
| 1206 |
|
<para><literal>False Northing</literal> (meters)</para></listitem> |
| 1207 |
</varlistentry> |
</varlistentry> |
| 1208 |
<varlistentry> |
<varlistentry> |
| 1209 |
<term>Transverse Mercator</term> |
<term>Transverse Mercator</term> |
| 1210 |
<listitem><para></para></listitem> |
<listitem><para><literal>Ellipsoid</literal></para> |
| 1211 |
|
<para><literal>Latitude</literal>of origin</para> |
| 1212 |
|
<para><literal>Longitude</literal>at central meridian</para> |
| 1213 |
|
<para><literal>Scale Factor</literal>at central meridian</para> |
| 1214 |
|
<para><literal>False Easting</literal> (meters)</para> |
| 1215 |
|
<para><literal>False Northing</literal> (meters)</para></listitem> |
| 1216 |
</varlistentry> |
</varlistentry> |
| 1217 |
<varlistentry> |
<varlistentry> |
| 1218 |
<term>Universal Transverse Mercator</term> |
<term>Universal Transverse Mercator</term> |
| 1219 |
<listitem><para></para></listitem> |
<listitem><para><literal>Ellipsoid</literal></para> |
| 1220 |
|
<para><literal>Zone</literal> |
| 1221 |
|
(can be guessed appling the Propose button)</para> |
| 1222 |
|
<para><literal>Southern Hemisphere</literal> flag</para></listitem> |
| 1223 |
</varlistentry> |
</varlistentry> |
| 1224 |
</variablelist> |
</variablelist> |
| 1225 |
|
|
| 1226 |
|
<para> |
| 1227 |
|
Thuban comes with a sample set of map projections for various |
| 1228 |
|
European countries. Apart from the basic projection they differ |
| 1229 |
|
especially in their parameterization: |
| 1230 |
|
</para> |
| 1231 |
|
<variablelist> |
| 1232 |
|
<varlistentry><term>Belgium Datum 1972 (Lambert Conic Conformal)</term> |
| 1233 |
|
<listitem><para></para></listitem> |
| 1234 |
|
</varlistentry> |
| 1235 |
|
|
| 1236 |
|
<varlistentry><term>Gauss-Boaga Zone 1 (Italy, Transverse Mercartor)</term> |
| 1237 |
|
<listitem><para></para></listitem> |
| 1238 |
|
</varlistentry> |
| 1239 |
|
|
| 1240 |
|
<varlistentry><term>Gauss-Krueger Zone 2 (Germany, Transverse Mercartor) |
| 1241 |
|
</term> |
| 1242 |
|
<listitem><para></para></listitem> |
| 1243 |
|
</varlistentry> |
| 1244 |
|
|
| 1245 |
|
<varlistentry><term>Reseau Geodesique Francaise |
| 1246 |
|
(France, Lambert Conic Conformal)</term> |
| 1247 |
|
<listitem><para></para></listitem> |
| 1248 |
|
</varlistentry> |
| 1249 |
|
|
| 1250 |
|
<varlistentry><term>UK National Grid (United Kingdom, Transverse Mercartor) |
| 1251 |
|
</term> |
| 1252 |
|
<listitem><para></para></listitem> |
| 1253 |
|
</varlistentry> |
| 1254 |
|
</variablelist> |
| 1255 |
|
|
| 1256 |
|
<para> |
| 1257 |
|
Thuban uses the comprehensive PROJ library for projections. PROJ provides |
| 1258 |
|
more than the four commonly used projections described above. If needed |
| 1259 |
|
Thuban can be easily extended to a new projection covered by PROJ. |
| 1260 |
|
</para> |
| 1261 |
</appendix> |
</appendix> |
| 1262 |
|
|
| 1263 |
</book> |
</book> |
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