david lovelace - analysing, displaying and sharing historic landscapes from field survey and archive...
TRANSCRIPT
![Page 1: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/1.jpg)
![Page 2: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/2.jpg)
![Page 3: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/3.jpg)
![Page 4: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/4.jpg)
![Page 5: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/5.jpg)
![Page 6: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/6.jpg)
![Page 7: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/7.jpg)
![Page 8: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/8.jpg)
![Page 9: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/9.jpg)
www.h2om.uk
![Page 10: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/10.jpg)
![Page 11: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/11.jpg)
1947 RAF air photo
![Page 12: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/12.jpg)
Geo-referencing the 1947 RAF air photo
Base layer layer to be transformed
Find reference points
![Page 13: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/13.jpg)
Control point error
![Page 14: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/14.jpg)
Both control points correct
![Page 15: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/15.jpg)
![Page 16: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/16.jpg)
![Page 17: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/17.jpg)
![Page 18: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/18.jpg)
![Page 19: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/19.jpg)
![Page 20: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/20.jpg)
![Page 21: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/21.jpg)
![Page 22: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/22.jpg)
![Page 23: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/23.jpg)
Ockley Wood
Barnet Wood
N
![Page 24: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/24.jpg)
N
![Page 25: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/25.jpg)
1840 Wigmore tithe map
![Page 26: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/26.jpg)
![Page 27: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/27.jpg)
![Page 28: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/28.jpg)
![Page 29: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/29.jpg)
1840 Wigmore Tithe Map
Woodwood formerly a ‘common wood’ in Deerfold Forest, enclosed in 1828
![Page 30: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/30.jpg)
George V opens the Elan Valley reservoirs
![Page 31: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/31.jpg)
![Page 32: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/32.jpg)
![Page 33: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/33.jpg)
![Page 34: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/34.jpg)
![Page 35: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/35.jpg)
![Page 36: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/36.jpg)
Digitising the Elan estate maps before transfer to the Museum of Wales
![Page 37: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/37.jpg)
Each map required 30 to 50 photos, linearly stitched to recreate the map at high resolution
![Page 38: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/38.jpg)
![Page 39: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/39.jpg)
![Page 40: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/40.jpg)
![Page 41: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/41.jpg)
The 27 maps covering 50,000 acres to stitched and georeferencedconverted to ecw served via OL3 from Geoserver – try this (fingers crossed)
www.r5r.eu/melica/index_elan.html
![Page 42: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/42.jpg)
The 27 maps covering 50,000 acres to stitched and georeferencedconverted to ecw served via OL3 from Geoserver – try this (fingers crossed)
www.r5r.eu/melica/index_elan.html
![Page 43: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/43.jpg)
My set up: Windows server 2008, IIS7, Tomcat 8, Geoserver 2.9.1, OL 3.14Setting up this stack to serve ecw rasters can be a pain for reasons I’m not sure about but I’m not alone looking at the forums.. I know ecw is a proprietary format but its convenient and effective + I’ve checked with current owners, Intergraph, and my usage does not infringe the licence (so far).
Even when GDAL is working from the command line, the Tomcat log files will show all is not well with Geoserver failing to see the relevant ecw libraries
And its a right old performance getting exactly the right version of GDAL, the right version of Visual Studio its compiled with, the drivers etc. for your particular stack
![Page 44: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/44.jpg)
Even when GDAL is working from the command line, the Tomcat log files will show all is not well so Geoserver is failing to see the relevant ecw libraries
Tomcat>logs>cataline.date.log18-Oct-2016 10:32:09.741 WARNING [http-apr-8080-exec-1] it.geosolutions.imageio.gdalframework.GDALUtilities.loadGDAL Failed to load the GDAL native libs. This is not a problem unless you need to use the GDAL plugins: they won't be enabled.
WTF! Oh, thanks a bundle that’s really helpful
![Page 45: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/45.jpg)
Manually restarting Tomcat seems to cure it for some reasonhere’s the Tomcat log file showing everything is hunk dory.
18-Oct-2016 11:44:42.998 INFO [localhost-startStop-1] it.geosolutions.imageio.gdalframework.GDALUtilities.loadGDAL GDAL Native Library loaded (version: 1.9.2).
And ecw is back on the menu as a recognised data store ready to be served....
![Page 46: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/46.jpg)
RAF 9” x 9” contact print.Norton Canon4th Dec 1946.Copied using a ‘pro-sumer’ digital camera (Sony A6300)
![Page 47: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/47.jpg)
The low sun angle of this sortie reveals a wealth of archaeological features
![Page 48: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/48.jpg)
![Page 49: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/49.jpg)
Successive frames are stitched together using Microsoft’s free Image Composite Editor (ICE)
![Page 50: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/50.jpg)
Finally the entire parish of Norton Canon is covered (except for one awkward sliver) and geo-referenced against an already geo-referenced 1st edition OS 25” to mile.
Exported as ecw to the Geoserver data store
![Page 51: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/51.jpg)
![Page 52: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/52.jpg)
www.r5r.eu/melica/index_nc.html
![Page 53: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/53.jpg)
Web page files in folder on the server:
![Page 54: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/54.jpg)
![Page 55: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/55.jpg)
![Page 56: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/56.jpg)
![Page 57: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/57.jpg)
I’ve simply opened up port 8080 through the firewall on server – probably not the best for security. Something I need to investigate.. reverse proxy?
![Page 58: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/58.jpg)
![Page 59: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/59.jpg)
![Page 60: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/60.jpg)
![Page 61: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/61.jpg)
![Page 62: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/62.jpg)
![Page 63: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/63.jpg)
![Page 64: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/64.jpg)
![Page 65: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/65.jpg)
Using a digital camera as a measuring and recording device
![Page 66: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/66.jpg)
Diameter in image = 47 pixels
![Page 67: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/67.jpg)
Import the image of tree from a calibrated digital camera into GIS to measure the girth of a tree
![Page 68: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/68.jpg)
Malvern Hills AONB veteran tree survey
![Page 69: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/69.jpg)
![Page 70: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/70.jpg)
![Page 71: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/71.jpg)
![Page 72: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/72.jpg)
![Page 73: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/73.jpg)
![Page 74: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/74.jpg)
![Page 75: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/75.jpg)
![Page 76: David Lovelace - Analysing, displaying and sharing historic landscapes from field survey and archive maps using QGIS, OpenLayers and Geoserver](https://reader031.vdocuments.net/reader031/viewer/2022030219/5885bf5e1a28ab6f168b671d/html5/thumbnails/76.jpg)
Whitfield Oak ring width vs date
0
1
2
3
4
5
6
7
8
9
10
1720 1740 1760 1780 1800 1820 1840 1860 1880 1900 1920 1940 1960 1980 2000
Year
Rin
g w
idth
mm
Ring width (dark red) mmRing x-section area (blue)
-5
0
5
10
15
20
25
30
35
40
1720 1740 1760 1780 1800 1820 1840 1860 1880 1900 1920 1940 1960 1980 2000
Year
Rin
g w
idth
mm
ring
are
a 10
00m
m2