1. Troubleshooting: Web maps & Joins Steve Signell, Instructor (signes@rpi.edu) Robert Poirier, TA (poirir@rpi.edu) School of Science Rensselaer Polytechnic Institute Monday, April 22, 2014 GIS in the Sciences ERTH 4750 (38031)

2. Group Webmaps Good job on the webmaps! Available here: http://giscience.tw.rpi.edu/rpi_group_projects/ Lets have a look…

3. Group Webmaps One thing they all need is some context– e.g. legends, interpretive text, etc. We’ll use the leaflet-sidebar plugin

4. leaflet-sidebar 1) Copy the sidebar folder to your website’s ‘plugin’ folder 2) Add in the references to the plugin.css and.js files in the appropriate places: 3) Add a for the sidebar: This is the sidebar content 4) Add the javascript: var sidebar = L.control.sidebar("sidebar", { closeButton: false, position: "left" }).addTo(map); //set the sidebar to show on load sidebar.show();

5. Eaters Map Add wms layer: var stop_heatmap = new L.TileLayer.WMS("http://173.11.102.171:8080/geoserver/rpi/wms", { layers: 'rpi:stop_heatmap', format: 'image/png', transparent: true }).addTo(map); Add icon to legend in layerControl: //make a layer control legend & toggle for the overlay maps var overlays = { "Restaurants": ratings, " Bus Stops": stops_87_286_289, "Bus Routes": troy_routes };

6. Farmers Map Naming consistency: file names are case-sensitive on some servers! Legend disappears: a code ordering issue: for legend Lets add the Sidebar and put the legend there!

7. Outcroppers Map Let’s make the layerControl expanded by default: var layerControl = L.control.layers(baseLayers, overlays, { collapsed: false, autoZIndex: "true" } ).addTo(map);

8. Watershedders Map Make sure the map isn’t too wide for the screen: var layerControl = L.control.layers(baseLayers, overlays, { collapsed: false, autoZIndex: "true" } ).addTo(map);

9. Dealing with CSVs and lots of columns Here we have a comma separated values (CSV) file with 500+ columns: How do we load this into PostGIS for analysis?

10. Dealing with CSVs and lots of columns Q: What’s the easiest way to load data into PostGIS? A: Shapefile import in PgAdmin/QGIS Can we make this table into a shapefile? This id is actually a state id (36) and a county ID put together

11. Dealing with CSVs and lots of columns Here’s the steps to join this to an existing shapefile and then import into PostGIS: 1) Download TIGER counties dataset 2) Bring into QGIS, clip to NY and reproject to UTM18N 3) Create 5 digit id to match the csv by combining state & city FIPS codes (field calculator) 4) Bring the csv into QGIS 5) In the shapefile properties, JOIN the shapefile to the csv using the matching fields 6) Save this as a new shapefile 7) Import shapefile into QGIS using PgAdmin (recommended) or QGIS

12. BREAK

13. Multidimensional Data II NetCDF: a data storage format for n-dimensional datasets. webgl: a javascript Library for 3d visualization ParaView

14. Homework 14 Thursday: Trip to KitWare