1 """ |
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2 The GeometryColumns and SpatialRefSys models for the SpatiaLite backend. |
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3 """ |
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4 from django.db import models |
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5 |
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6 class GeometryColumns(models.Model): |
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7 """ |
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8 The 'geometry_columns' table from SpatiaLite. |
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9 """ |
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10 f_table_name = models.CharField(max_length=256) |
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11 f_geometry_column = models.CharField(max_length=256) |
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12 type = models.CharField(max_length=30) |
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13 coord_dimension = models.IntegerField() |
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14 srid = models.IntegerField(primary_key=True) |
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15 spatial_index_enabled = models.IntegerField() |
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16 |
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17 class Meta: |
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18 app_label = 'gis' |
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19 db_table = 'geometry_columns' |
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20 managed = False |
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21 |
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22 @classmethod |
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23 def table_name_col(cls): |
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24 """ |
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25 Returns the name of the metadata column used to store the |
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26 the feature table name. |
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27 """ |
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28 return 'f_table_name' |
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29 |
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30 @classmethod |
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31 def geom_col_name(cls): |
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32 """ |
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33 Returns the name of the metadata column used to store the |
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34 the feature geometry column. |
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35 """ |
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36 return 'f_geometry_column' |
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37 |
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38 def __unicode__(self): |
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39 return "%s.%s - %dD %s field (SRID: %d)" % \ |
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40 (self.f_table_name, self.f_geometry_column, |
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41 self.coord_dimension, self.type, self.srid) |
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42 |
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43 class SpatialRefSys(models.Model): |
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44 """ |
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45 The 'spatial_ref_sys' table from SpatiaLite. |
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46 """ |
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47 srid = models.IntegerField(primary_key=True) |
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48 auth_name = models.CharField(max_length=256) |
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49 auth_srid = models.IntegerField() |
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50 ref_sys_name = models.CharField(max_length=256) |
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51 proj4text = models.CharField(max_length=2048) |
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52 |
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53 @property |
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54 def wkt(self): |
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55 from django.contrib.gis.gdal import SpatialReference |
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56 return SpatialReference(self.proj4text).wkt |
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57 |
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58 class Meta: |
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59 abstract = True |
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60 db_table = 'spatial_ref_sys' |
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61 managed = False |
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