Autodesk 15606-011408-9320 User Guide - Page 113

About Coordinate Precision, Choosing a Coordinate System, MapGuide SDF Loader

Get Autodesk 15606-011408-9320 - MAPGUIDE R6.3 CPU MODEL-UPG 4/5 MIN 2 CPUS INITL PDF manuals and user guides
UPC - 606121429586
View all Autodesk 15606-011408-9320 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 113 highlights

Note that if you are using arbitrary xy data, it is not converted to latitude/longitude, so you can use it only in maps that use arbitrary xy as the coordinate system and in which all data is in arbitrary xy. For more information, see the Autodesk MapGuide SDF Loader Help (SDFLOAD.HLP) located in the SDF Loader directory. To see a complete list of the coordinate systems in Autodesk MapGuide, as well as their corresponding codes that you use with the /COORDSYS parameter in the SDF Loader, refer to the file cscodes.txt that is installed with the SDF Loader. About Coordinate Precision Coordinate precision is the level of accuracy at which a point can be stored and retrieved to match its original location. When you use the Autodesk MapGuide SDF Loader, Autodesk MapGuide SDF Component Toolkit, or AutoCAD Map to convert your data to an SDF file, you can specify whether to use single (32-bit) precision or double (64-bit) precision. For latitude/longitude coordinates, single precision is accurate to about 16 feet or 5 meters, whereas double precision is accurate to better than a fraction of an inch or 1 MM. Single precision is usually more than enough accuracy for most applications, but if you are creating very large-scale maps for applications that require that you accurately pinpoint items, you might need double precision. If you are using arbitrary xy coordinates and the base unit of the map is already very small (such as inches on a facilities management map of office equipment), single precision will probably be sufficient. For more information, refer to the Coordinate Precision White Paper at: http://www.autodesk.com/utilitypapers Choosing a Coordinate System If you do not know which coordinate system to use, or if you need to decide which system to use in your office or department, consider your options in this order:  Consult with the data engineer who provided your data.  Use the same coordinate system as other staff in your organization.  Use the same coordinate system as your most common data source.  Choose the coordinate system used by people who share data with you.  If the area is small, use the same coordinate system as your local city or county government. If the area is large, use the same system as the state, regional, provincial, or national mapping group. Designing the Map | 113

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
  • 187
  • 188
  • 189
  • 190
Designing the Map
|
113
Note that if you are using arbitrary xy data, it is
not
converted to lati-
tude/longitude, so you can use it only in maps that use arbitrary xy as the
coordinate system and in which all data is in arbitrary xy. For more informa-
tion, see the
Autodesk MapGuide SDF Loader Help
(SDFLOAD.HLP) located in
the SDF Loader directory.
To see a complete list of the coordinate systems in Autodesk MapGuide, as
well as their corresponding codes that you use with the /COORDSYS param-
eter in the SDF Loader, refer to the file
cscodes.txt
that is installed with the SDF
Loader.
About Coordinate Precision
Coordinate precision is the level of accuracy at which a point can be stored
and retrieved to match its original location. When you use the Autodesk
MapGuide SDF Loader, Autodesk MapGuide SDF Component Toolkit, or
AutoCAD Map to convert your data to an SDF file, you can specify whether
to use single (32-bit) precision or double (64-bit) precision. For lati-
tude/longitude coordinates, single precision is accurate to about 16 feet or 5
meters, whereas double precision is accurate to better than a fraction of an
inch or 1 MM. Single precision is usually more than enough accuracy for
most applications, but if you are creating very large-scale maps for applica-
tions that require that you accurately pinpoint items, you might need double
precision. If you are using arbitrary xy coordinates and the base unit of the
map is already very small (such as inches on a facilities management map of
office equipment), single precision will probably be sufficient.
For more information, refer to the Coordinate Precision White Paper at:
http://
www.autodesk.com/utilitypapers
Choosing a Coordinate System
If you do not know which coordinate system to use, or if you need to decide
which system to use in your office or department, consider your options in
this order:
Consult with the data engineer who provided your data.
Use the same coordinate system as other staff in your organization.
Use the same coordinate system as your most common data source.
Choose the coordinate system used by people who share data with you.
If the area is small, use the same coordinate system as your local city or
county government. If the area is large, use the same system as the state,
regional, provincial, or national mapping group.