Python Geospatial Development, 2nd Edition: Learn to build sophisticated mapping applications from scratch using Python tools for geospatial development

Cover......Page 1
Copyright......Page 3
Credits......Page 4
About the Author......Page 5
About the Reviewers......Page 6
www.PacktPub.com......Page 8
Table of Contents......Page 10
Preface......Page 18
 Python......Page 24
 Geospatial development......Page 26
  Analyzing geospatial data......Page 29
  Visualizing geospatial data......Page 31
  Creating a geospatial mash-up......Page 33
 Recent developments......Page 34
 Summary......Page 36
 Core GIS concepts......Page 38
  Location......Page 39
  Distance......Page 42
  Units......Page 44
   Cylindrical projections......Page 46
   Conic projections......Page 48
   Azimuthal projections......Page 49
   The nature of map projections......Page 50
  Coordinate systems......Page 51
  Datums......Page 53
  Shapes......Page 54
 GIS data formats......Page 56
 Working with GIS data manually......Page 58
 Summary......Page 66
 Reading and writing geospatial data......Page 68
   GDAL design......Page 69
   GDAL example code......Page 72
   OGR design......Page 73
   OGR example code......Page 74
  Availability......Page 75
  pyproj......Page 76
   Proj......Page 77
   Geod......Page 78
  Example code......Page 79
  Documentation......Page 80
  Availability......Page 81
  Design......Page 83
  Example code......Page 85
  Availability......Page 86
 Visualizing geospatial data......Page 87
  Mapnik......Page 88
  Design......Page 89
  Example code......Page 91
  Availability......Page 93
 Summary......Page 94
Chapter 4: Sources of Geospatial Data......Page 96
  OpenStreetMap......Page 97
   Data Format......Page 98
   Obtaining and using OpenStreetMap data......Page 99
  TIGER......Page 101
   Data format......Page 103
   Obtaining and Using TIGER Data......Page 104
  Natural Earth......Page 105
   Obtaining and using Natural Earth vector data......Page 106
  Global self-consistent, hierarchical, high-resolution shoreline database (GSHHS)......Page 107
   Data format......Page 108
  World Borders Dataset......Page 109
 Sources of geospatial data in raster format......Page 110
  Landsat......Page 111
   Obtaining Landsat imagery......Page 112
  Natural Earth......Page 115
   Obtaining and using Natural Earth raster data......Page 116
   Data format......Page 117
   Obtaining and using GLOBE data......Page 118
  National Elevation Dataset (NED)......Page 119
   Obtaining and using NED data......Page 120
 Sources of other types of geospatial data......Page 122
  GEOnet Names Server......Page 123
  Geographic Names Information System (GNIS)......Page 124
   Data format......Page 125
 Choosing your geospatial data source......Page 126
 Summary......Page 127
 Pre-requisites......Page 128
  Task – calculate the bounding box for each country in the world......Page 129
  Task – save the country bounding boxes into a shapefile......Page 131
  Task – analyze height data using a digital elevation map......Page 136
 Changing datums and projections......Page 143
  Task – change projections to combine shapefiles using geographic and UTM coordinates......Page 144
  Task – change the datums to allow older and newer TIGER data to be combined......Page 149
 Representing and storing geospatial data......Page 152
  Task – calculate the border between Thailand and Myanmar......Page 153
  Task – save geometries into a text file......Page 157
  Task – identify parks in or near urban areas......Page 158
 Converting and standardizing units of geometry and distance......Page 163
  Task – calculate the length of the Thai-Myanmar border......Page 164
  Task – find a point 132.7 kilometers west of Soshone, California......Page 171
 Exercises......Page 173
 Summary......Page 175
 Spatially-enabled databases......Page 176
 Spatial indexes......Page 177
  MySQL......Page 180
   Installing and configuring PostGIS......Page 185
   Using PostGIS......Page 187
   Documentation......Page 189
   Advanced PostGIS Features......Page 190
   Installing SpatiaLite......Page 191
   Accessing SpatiaLite from Python......Page 192
   Documentation......Page 193
   Using SpatiaLite......Page 194
   SpatiaLite capabilities......Page 195
 Commercial Spatially-Enabled Databases......Page 196
  MS SQL Server......Page 197
  Using the database to keep track of spatial references......Page 198
  Using the appropriate spatial reference for your data......Page 200
   Option 1 – Using a database that supports geographies......Page 201
   When to use unprojected coordinates......Page 202
  Avoiding on-the-fly transformations within a query......Page 203
  Don\'t create geometries within a query......Page 204
   Using spatial indexes appropriately......Page 205
   MySQL......Page 206
   PostGIS......Page 208
   SpatiaLite......Page 210
  Working with MySQL......Page 212
  Working with PostGIS......Page 216
  Working with SpatiaLite......Page 218
  Comparing the databases......Page 221
 Summary......Page 222
 About DISTAL......Page 224
 Designing and building the database......Page 228
  GNIS......Page 233
 Importing the data......Page 234
  World Borders Dataset......Page 235
  GSHHS......Page 237
  US places\' name data......Page 239
  Worldwide places\' name data......Page 244
 Implementing the DISTAL application......Page 246
  The shared \"database\" module......Page 249
  The \"select country\" script......Page 250
  The \"select area\" script......Page 253
   Calculating the bounding box......Page 258
   Calculating the map\'s dimensions......Page 259
   Setting up the data source......Page 262
   Rendering the map image......Page 263
  The \"show results\" script......Page 265
   Identifying the clicked-on point......Page 266
   Identifying features by distance......Page 267
   Displaying the results......Page 276
  Usability......Page 279
   Lat/Long coordinate problems......Page 281
   Finding the problem......Page 283
   Improving performance......Page 286
   Calculating the tiled shorelines......Page 288
   Using the tiled shorelines......Page 297
 Summary......Page 299
Chapter 8: Using Python and Mapnik to Generate Maps......Page 302
 Introducing Mapnik......Page 303
 Creating an example map......Page 309
  Data sources......Page 313
   Shapefile......Page 314
   PostGIS......Page 315
   Gdal......Page 317
   Ogr......Page 318
   SQLite......Page 319
   OSM......Page 320
  Rules, filters, and styles......Page 321
   Filters......Page 322
   Scale denominators......Page 324
   \"Also\" rules......Page 326
   Drawing lines......Page 327
   Drawing polygons......Page 333
   Drawing labels......Page 336
   Drawing points......Page 346
   Drawing raster images......Page 350
   Using colors......Page 352
  Maps and layers......Page 353
   Map attributes and methods......Page 354
   Layer attributes and methods......Page 355
  Map rendering......Page 356
 MapGenerator revisited......Page 358
  The MapGenerator\'s interface......Page 359
  Creating the main map layer......Page 360
  Displaying points on the map......Page 361
  Rendering the map......Page 362
 Map definition files......Page 363
 Summary......Page 367
 About the ShapeEditor......Page 370
 Designing the ShapeEditor......Page 374
  Importing a shapefile......Page 375
  Selecting a feature......Page 377
 Prerequisites......Page 379
 The structure of a Django application......Page 380
  Models......Page 382
  URL dispatching......Page 383
  Templates......Page 386
 Setting up the database......Page 388
 Setting up the ShapeEditor project......Page 390
 Creating the shared application......Page 392
 Defining the data models......Page 394
  Attribute......Page 395
  AttributeValue......Page 396
  The models.py file......Page 397
 Playing with the admin system......Page 401
 Summary......Page 408
 Implementing the \"list shapefiles\" view......Page 410
 Importing shapefiles......Page 415
  The \"import shapefile\" view function......Page 416
  Extracting the uploaded shapefile......Page 420
   Open the shapefile......Page 422
   Add the Shapefile object to the database......Page 423
   Define the shapefile\'s attributes......Page 424
   Store the shapefile\'s features......Page 425
   Store the shapefile\'s attributes......Page 427
  Cleaning up......Page 430
 Exporting Shapefiles......Page 431
  Define the OGR Shapefile......Page 432
  Saving the features into the shapefile......Page 433
  Saving the attributes into the shapefile......Page 435
  Returning the ZIP archive to the user......Page 437
 Summary......Page 439
Chapter 11: ShapeEditor – Selecting and Editing Features......Page 440
 Selecting a feature to edit......Page 441
  Implementing the Tile Map Server......Page 442
   Setting up the Base Map......Page 452
   Tile rendering......Page 455
  Using OpenLayers to display the map......Page 461
  Intercepting mouse clicks......Page 466
  Implementing the find feature view......Page 471
 Editing features......Page 477
 Adding features......Page 485
 Deleting features......Page 488
 Deleting shapefiles......Page 489
 Further improvements and enhancements......Page 491
 Summary......Page 492
Index......Page 494