User Guide - Digimap

More documents

Recommendations

Info

Table 4: Attribution by feature type Attribute Accuracy of height above ground level Accuracy of height above datum Accuracy of position Anchor point Anchor position Topographic area Topographic line Broken Calculated area value Boundary line Topographic point Cartographic symbol Cartographic text Change date Descriptive group Descriptive term Feature code Font Height Height above datum Height above ground level Make Non-bounding line Orientation Physical level Physical presence Point Polygon Polyline Reason for change Reference to feature Theme TOID Text string Version Version date The next section describes the attributes that are common to all features. Attributes are grouped into those associated to the referencing and change management of the feature, and those that are descriptive, that is that detail properties of the real-world object the feature represents. OS MasterMap Topography Layer user guide chapter 5 v1.3 – 07/2007 © Crown copyright Page 42 of 140
Common attribution Feature referencing attributes Theme A theme to which the feature belongs. This will be one or more of the themes described in chapter 4. TOID The unique identifier comprising a number and the four-letter prefix ‘osgb’. It is recommended that the TOID be treated as a character rather than a number as some TOIDs have zeros at the beginning; the TOID should always be retained/stored in its entirety. Life-cycle metadata Version The version number of the topography feature. Version date The date this version of the feature became the current version. This is the date on which the feature was changed in the database, and is not the date when the real-world object it represents changed. Reason for change The reason why a new version (or new feature) has been created or changed. There can be more than one reason per version. Change date The date of the above reason for change. This will not necessarily be the same as the version date. It is likely to be earlier as it records when the change was observed by survey in the real world. Reason for change and change date are collectively known as the change history attributes, as they give the reasons that have led to this particular version of a feature coming into existence. All change history for a feature is supplied in GML. Feature description attributes There are four attributes common to all features that make up the descriptive attributes. These are descriptive group, descriptive term, physical level and physical presence. Descriptive group This is the primary classification attribute of a feature. It assigns a feature to one or more of 21 groups, most of which are categories of real-world topographic objects such as path, building or natural environment. Others are categories of supportive or administrative features such as network or polygon closing geometry and political or administrative boundaries. Descriptive term This attribute, if present, gives further classification information about the feature. A feature may have multiple descriptive term attributes, but this is little used at present. Most features have zero or one descriptive term attributes. A situation where multiple descriptive term attributes are used is where polygon features have a descriptive group with the value of ‘natural environment’. These features can have one or more descriptive term attributes specifying the natural land cover types present in the area. The descriptive group and term attributes are frequently used in applying styling and in querying. It makes the data more flexible and customisable in terms of customers being able to manipulate just the features they are interested in for any particular application. OS MasterMap Topography Layer user guide chapter 5 v1.3 – 07/2007 © Crown copyright Page 43 of 140
Page 2 and 3: OS MasterMap Topography Layer User
Page 4 and 5: Preface This user guide (hereafter
Page 6 and 7: Chapter 1 Introduction to OS Master
Page 8 and 9: The vector and raster data models T
Page 10 and 11: Currently, national cover is availa
Page 12 and 13: Address Layers OS MasterMap Address
Page 14 and 15: Imagery Layer The Imagery Layer com
Page 16 and 17: Chapter 2 Introduction to OS Master
Page 18 and 19: It is important for many applicatio
Page 20 and 21: Chapter 3 Feature life cycles and t
Page 22 and 23: One of the key differences between
Page 24 and 25: Joining of polygon features When tw
Page 26 and 27: The other type is a polygon closing
Page 28 and 29: Chapter 4 OS MasterMap Topography L
Page 30 and 31: A textual description is used for c
Page 32 and 33: Rail These are defined as features
Page 34 and 35: There are two situations where cons
Page 36 and 37: Figure 17 shows a sample of real-wo
Page 38 and 39: Table 3 Value of descriptive group
Page 40 and 41: This chapter has discussed the them
Page 44 and 45: Physical level The physical level a
Page 46 and 47: Text string Cartographic text that
Page 48 and 49: The advantages of supplying COU rat
Page 50 and 51: Supply of OS MasterMap Topography L
Page 52 and 53: Departed features are supplied in C
Page 54 and 55: Chapter 7 Change management and dat
Page 56 and 57: This is a more efficient way of sto
Page 58 and 59: Figure 28: Styling options with OS
Page 60 and 61: Annexe A Administrative boundary al
Page 62 and 63: OS MasterMap Topography Layer Techn
Page 64 and 65: Symbols ...........................
Page 66 and 67: Chapter 1 Key concepts This section
Page 68 and 69: Chapter 3 Theme definitions This ch
Page 70 and 71: Chapter 4 Feature attribution In OS
Page 72 and 73: CartographicSymbol Attribute Occurr
Page 74 and 75: Simple attribute name Type Descript
Page 76 and 77: Simple attribute name Type Descript
Page 78 and 79: Chapter 6 Attribute values Attribut
Page 80 and 81: The following table clarifies the u
Page 82 and 83: Descriptive group Feature type Desc
Page 84 and 85: Make Descriptive group Feature type
Page 86 and 87: Chapter 7 Geometry and topology Int
Page 88 and 89: Example class model Rectangle A rec
Page 90 and 91: Polygon boundary duplication A brea
Page 92 and 93:
Chapter 9 GML output format The OS
Page 94 and 95:
For geographically chunked data, if
Page 96 and 97:
For example: 12365.563,8975.676
Page 98 and 99:
Schema descriptions The W3C-provide
Page 100 and 101:
descriptiveGroup descriptiveTerm ma
Page 102 and 103:
Property application logic This sec
Page 104 and 105:
Chapter 11 Data supply service The
Page 106 and 107:
Annexe A Glossary The purpose of th
Page 108 and 109:
georectified imagery The georectifi
Page 110 and 111:
orthorectified imagery The Imagery
Page 112 and 113:
Annexe B GML examples 1 A typical T
Page 114 and 115:
Annexe C Cartographic style definit
Page 116 and 117:
Fonts The gml2svg.xsl declares the
Page 118 and 119:
Geometry: boundaryMereingChangeSy
Page 120 and 121:
triangulationStationSymbol Style: s
Page 122 and 123:
multiVegetationFillSymbol Style: st
Page 124 and 125:
screeFillSymbol Style: stroke:#6666
Page 126 and 127:
smallNonconiferousTreeFillSymbol St
Page 128 and 129:
Definitions Transformation 1 Symbol
Page 130 and 131:
Name: roughGrassAndMarshFillSymbol
Page 132 and 133:
Name: roughGrassScatteredRocksAndHe
Page 134 and 135:
nonconiferousTreesAndScrubPattern r
Page 136 and 137:
Water bold Name - waterBoldLine str
Page 138 and 139:
Parliamentary Name - parliamentaryL
Page 140:
Acute accent on the following (for
show all

User Guide - Digimap

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?