Marine Digimap 17 March 2010 Tom Armitage Vivienne Carr

Objectives By the end of this session, you will be able to:  Create maps on screen  Save and print maps  Download data  Find help within Marine Digimap

Marine Digimap Home Page Marine Lexicon 2 data download facilities: Hydrospatial Download Charter Raster Download Make a map

Marine Maps

Maps can be viewed on screen or printed/downloaded at A4. Source data - maps are created from scanned Admiralty Chart images, covering the UK and the surrounding seas. The maps are grouped into 6 scale bands; ocean, sea, general, coastal, approaches and harbour (roughly equivalent to the usage bands of Admiralty Charts). Each scale band features a different set of Admiralty Charts, with features most relevant to the scale. The scanned images are used to build up a mosaic of maps for each scale band. Scales vary from 1:3.5million to 1:2,500. These make ideal backdrop maps, but must NOT be used for navigation.

Scale/Usage bands Ocean - small scale ( 1:3,500,000 to 1:750,000) Sea - small scale (> 1:750,000 to 1:300,000) General - small to mid scale (1:200,000 to 1:100,000) Coastal - mid scale ( 1:100,000 to 1:50,000) Approaches - mid to large scale ( 1:50,000 to 1:15,000) Harbour - large scale ( 1:25,000 to 1:2,500)

Marine Maps Source maps may be at different scales. In Marine, maps are viewed at same scale so you may find some differences in detail in adjacent areas.

Marine Maps home page Use the drop down menu to view areas covered by different usage bands. To search, enter details in a search box or click on the map to go to your area of interest.

Location Map Shows the wider area around your current area (red square). Allows you to select and view the coverage of other usage bands, in that area. Can pan around the location map by clicking and dragging the red square.

Different map views Switch views by clicking on the icons above the map Zoom in and out of that view, using the bar to the left of the map

Legend The legend shows the more commonly found symbols on Marine Maps More detailed information available from the Marine Lexicon

Map Chest Maps can be saved in Map Chest Unique to each user Maps erased after 5 days Print from Map Chest as: –PNG format –A4

Exercise 1.Login UK Federation Training accounts: Username: etrain01….etrain25 Password: Tr Select Marine Maps 3.Search for North Berwick 4.Practise: Viewing map coverage Switch view, re-centre, zoom in and out Saving and Printing

Marine Download services: Charted Raster Download Hydrospatial Download

Charted Raster data

Used in the Marine Maps facility. Scanned Admiralty Charts covering the UK and the surrounding seas from 1:3.5million to 1:2,500. The data is supplied as GeoTiff images, ready for use in a GIS. Each map has its own projection, referenced to the Horizontal WGS84 Datum. These data make ideal backdrop maps, but must NOT be used for navigation

Hydrospatial data

Hydrospatial Data This is a vector data product from SeaZone, designed for use in a GIS. Available in 2 formats: –Shapefile (for ArcGIS) –MapInfo Tab The data is collected at various scales, the best available for each source. As vector data it is scale free when displayed. The data is projected in WGS84 not British National Grid. 7 data Topics are available.

Hydrospatial Data 7 Topics: 1.Bathymetry & Elevation (BE) 2.Socio-Economic & Marine Use (SE) 3.Conservation & Environment (CE) 4. Natural & Physical Features (NP) 5. Structures & Obstructions (SO) 6. Climate & Oceanography (CO) 7. Metafeatures & Cartography (MC)

Hydrospatial Data Each Topic has layers of detail. Depending on the area selected for download, they may not all be available. Example: –Structures and Obstructions Navigation Aides Obstructions Offshore Installations Shoreline Constructions Wrecks

Exercise Download the Structures and Obstructions Topic, in ESRI Shape file format. Take the Wrecks layer only. Tile numbers: –NW –NW Search using the tile names or click on the map around the Lizard in Cornwall. Download the data to a suitable place. Unzip the data.zip file to extract the files.

Your wrecks data Need all 4 files for Shape files to work – DBF, PRJ, SHP, SHX

Viewing your data Steps: 1.Open ArcGIS 2.Add the Wrecks data you downloaded earlier (Shape files) 3.Unzip the OS raster data 4.Add the OS raster data – provided by EDINA 5.Change the Data frame properties to British National Grid: View > Data Frame properties > Coordinate System > Predefined > Projected Coordinate System 6.Open the attribute table of your Wrecks data

Onward use of data Hydrospatial data: Older versions of ArcGIS not supported. Can’t guarantee data will work in ArcView 3.x Shape files, no need to convert All of the files provided with Shape files must be kept in the same folder For correct data display, need to download and install 2 folders: –fonts.zip –style.zip –both available in Help > Using data with ArcGIS

Onward use of data Charted raster data: GeoTIFF files with georeferencing encoded within them n.b. ArcGIS 9.0 and 9.1 need the latest service packs installed to georeference TIFF images

Questions

Download processes

Charted Raster download process

Step 1: Search for location Select the Scale bands of interest –use the coverage map to see which bands are available for your area –bands deselected can be added back in when choosing maps Search using one of the options Select your location from the list of results, if applicable

Step 2: Select maps Choose the maps you want from the list or click on the map Use the zoom and scale bands to see larger or smaller maps in the area Click Continue

Step 3: Make settings Option to take other sections of Multiple part maps Previews of all maps available Archiving and compression Extra box to tick to confirm you are aware that charts are NOT for navigation Click Extract Data

Step 4: Downloading Click the link to go to the download page Use your browser's ‘Save link as..’ or ‘Save target as..’ option

Hydrospatial Download

Hydrospatial download process: Identify product / format Search for your location Select the required data Make download settings Download data

Step 1: Product/format Select product/topic Choose data format Click Continue

Step 2: Search for location Select a search method and input search terms Choose a result from the list generated, where applicable

Step 3: Select data tiles Choose the tiles you want from the list or map Choose the required layers Click Save layer selection Click continue

Step 4: Make settings Archiving and compression Large numbers of component files mean no individual file downloads Click Extract data

Step 5: Downloading Use your browser's ‘Save link as..’ or ‘Save target as..’ option Click the link to go to the download page