Digimap data in ArcGIS - PowerPoint Presentation

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Digimap data in ArcGIS

Guy McGarvaEDINA Geo User Support

Ian HolmesSlide2

Poll

What is the one thing you most want to learn today?What map data is available from DigimapHow do I get the data from DigimapWhat data formats should I use in ArcGIS

Tips on using ArcGISOtherSlide3

What data is available?

How do I use Data Download to get data for ArcGIS?

What formats should I pick for using in ArcGIS?How do I load data into ArcGIS?How do I style my data?Tips:ProjectionsProcessingResourcesContentSlide4

Digimap Home PageSlide5

What data is available from Digimap?

Ordnance Survey (OS) – Full range of OS maps and data available including OS MasterMap and OS OpenDataHistoric – Detailed historic OS maps from 1843-1990sGeology

– Onshore and offshore geological datasetsMarine – Marine and coastal zone dataEnvironment – Land cover datasetsAll data can be used in ArcGIS in one form or another!Slide6

How do I download map data?

Data Download – download OS and other mapping data for use in ArcGISThere are similar applications for all other collectionsSlide7

Data Download in Other CollectionsSlide8

Using Data Download

Three steps:Select areaChoose dataAdd to basket -

options to change format, version and layersSlide9

OS Data Download

All available OS map data products are in Data DownloadDownload several map products in one order 6 categories of map dataNote

– you can make multiple orders to get more than the Allowance for a single orderSlide10

Data Download

Click + or - on category name to open and see available map data products:OS MasterMap – most detailed topographic mapping of GB, transport network map data and Greenspace map

Background Mapping – raster maps at range of scales, all in TIFF formatLand and Height data – contours and Digital Terrain ModelsVector data – range of scales and formats Boundary and Location data – administrative boundaries, postcode data, gazetteersWithdrawn datasets – old, unmaintained datasetsSlide11

Availability Grid

Shows availability of different products

Shows Reference gridsCan select areas by Tile NamesSlide12

Basket options

Select version, format and layers in the basket.Options vary between map data products.Slide13

What formats should I use for ArcGIS?

VectorShapefile – if availableFile Geodatabase –MM Topo and Building HeightsGML (for OS MasterMap and VML) – only if needed

RasterTIFF – for rasterASC (for DTM)Slide14

Check format availability

Check the Information boxes.Every product in Vector Data category available in Shape format.The most up-to-date contours are also available as Shape.Slide15

What do Shape files look like?

Remember to keep all constituent parts together - SHP, DBF, SHX, PRJ.Example of folder containing VectorMap Local shape files.

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OS MasterMap

TopographyRecommend you take File Geodatabase for use in ArcGIS (FGDB).Alternative: Take GML and convert to Shape or File Geodatabase using tools detailed in Help pages.Why would I convert GML?- Can select the feature types you import

- Can merge several orders togetherSlide17

Use Productivity Suite to process GML

Creates a File GeodatabaseCan select Feature Types to processCan process multiple Chunks and Multiple OrdersRequired for ITN to build network datasetSlide18

Raster data formats

TIFF

Raster data (backdrop mapping) all supplied in TIFF image formatSome TIFFs are supplied with a TFW file - a plain text World file – must be kept with the TIF fileWorld Files contain the geographic coordinates,

scale and rotation of TIFF map.

ASC

DTM and Gridded Bathymetry dataSlide19

Formats and conversion guidance

http://digimap.edina.ac.uk/webhelp/os/data_information/data_formats/new_data_translators.htmSlide20

Download zip file contents

Within each zip file:

Folder for each map productContents text fileCitations text fileYou must extract the data from the zip file before using the data in ArcGIS:Either use the Windows ‘built-in’ uncompress option “Extract All” available when you right click on the zip fileOr use software such as 7-Zip or WinZip to extract the data from the zip file.Slide21

Poll- Where do you get data?

What sources do you use to get data for ArcGIS, select all that apply:DigimapBuilt-in Esri Basemaps or Esri Portal

Data.Gov or other open portalYour own dataOther sourceSlide22

Loading data into ArcGIS

Use the Add Data button

Select Folder Connections to add downloaded dataCan also “Drag and Drop” file into ArcMapSlide23

Adding raster data e.g. 25K Raster

- Select multiple files if you want.

- Will automatically show files that can be loaded e.g. TIF files, Shapefiles, ASC or File Geodatabase- You might get a warning saying they have missing spatial reference information. - Ignore for now.Slide24

Adding Shapefiles e.g. VML

Select multiple feature classesNote there are separate feature classes for points , lines and areas

There are separate feature classes for each tileExample tile of VML without sylingSlide25

Adding File Geodatabase e.g. MM Topo

Navigate to .

gdb fileDouble click on itFeature classes in database will be displayedSelect all Feature classesSlide26

Displaying Data

If data is not visible, Right Click on Layer and click Zoom to Layer.It will zoom to the extents of the selected map sheet.Slide27

Styling vector data in ArcGIS

Vector data (e.g. OS MasterMap, OS VectorMap Local) will not have the same appearance as it does in Digimap, when viewed in ArcGISMay want to consider styling the data to emphasise certain things on the map, or to try and match the OS cartographic style

For more details see: http://digimap.edina.ac.uk/webhelp/digimapgis/arcgis/standard_arcgis_functions/applying_style_files.htmSlide28

Styling options

In ArcGIS – do this in Symbology tab of map layer properties:Option: apply

a layer or style file that contains styling information – find available files in Digimap Help pages.Note: Data information pages for each product has a link to a Style File on itSlide29

Style files from Digimap

Digimap provides style files for some vector data productsNeed to look on the product information pageFind this via the Data Download Information box  More info link

Some can be downloaded from OS websiteSome products have the Symbology file in the download zipSlide30

Other sources of style files

For OS MasterMap:Productivity Suite: – symbology files available with the software but must be used with data processed through Productivity Suite:

http://www.esriuk.com/software/arcgis/productivitysuite/download#InterpOSe:provide a style file for ArcGIS with the InterpOSe installerMust be used with data processed through InterpOSe:http://misoportal.com/data/interpose-for-digimap/These are data conversion tools often used with OS MasterMap – full details in the Format and Conversion tools page mentioned earlier.Slide31

Projections and Transformation in ArcGIS

Need to think about, if:You are setting the Coordinate System on an existing datasetYou are overlaying data with different coordinate systemsYou want to overlay Esri Basemap data with OS data

See: http://digimap.edina.ac.uk/webhelp/digimapgis/index.htm#projections_and_transformations/transformations_in_arcgis.htmSlide32

Otherwise: Data in WGS 84 and OSGB 36

What if you want to overlay data or use the Esri

Basemaps?Most Esri Basemap data is in WGS 84OS data is in OSGB 36Showing VectorMap Local overlaid on the Esri Imagery BasemapErrors of over 100m by defaultSlide33

Common Geoprocessing

ToolsMergeMosaicClipFor details see: http://digimap.edina.ac.uk/webhelp/digimapgis/index.htm#arcgis/standard_arcgis_functions/viewing_data_in_arcmap.htmSlide34

Vector data – Merge tool

Where your download area covers multiple tiles, possible to merge the tiles into oneImage:

OS Terrain contours in ArcMap, before merge (SE England)Slide35

Raster data – Mosaic toolSlide36

Clip tool

Where tiles are provided in large sizes e.g. 100 x 100 km, possible to clip them to smaller areaTo use the clip tool, necessary to have a Shape file of the smaller area to use as the guide

Image: Vector Map District clipped to smaller area in ArcMapSlide37

Poll

What software do you use most often with geospatial data?ArcGISQGIS or other open source software AutoCAD or other CAD softwareI don’t use any GIS/CAD softwareOtherSlide38

Recent OS OpenData

additionsOS Open Map Localtopography data, 1:10000OS Open Riverswatercourse name; watercourse type; direction of water flow – 1:15000 to 1:30000OS Open Roads

Motorways, A roads, B road – 1:15000 to 1:30000OS Open Namescomprehensive list of Great Britain’s place names, road names and numbers and postcodes combined into one product.Slide39

Other recent additions

OS MasterMapBuilding Heights in File Geodatabase formatUrban Paths (for use with ITN)Sites layer in GML format.Sites data enables you to:Locate all of the main points of access to key sites quickly and easily in emergency situations.

Understand their proximity and exposure to risks such as crime and floods.Plan the routes of buses, refuse lorries and postal deliveries to meet the demand they generate.Understand in detail the potential impacts of planned works or events on important locations.Points of InterestPoints of Interest classifies 4 million places and real-world features in Great Britain by their use and function in a 3-tier hierarchy, also providing their postal address or location.Slide40

Resources

Digimap Resource centre – access help pages, guides, FAQs, videos, case studies and more.Slide41

Help pages

Digimap Resource centre: http://digimap.edina.ac.uk/webhelp/resources/index.htmlSlide42

PDF exercises

Exercises available for downloadPDF step by stepSome with data providedSlide43

Chat

Usually manned in office hours.Slide44

Poll

Today’s webinar:I learnt something newI didn’t learn anything newWas a good use of my timeWas a poor use of my timeOther