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

Group Webmaps Good job on the webmaps! Available here: Lets have a look…

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

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();

Eaters Map Add wms layer: var stop_heatmap = new L.TileLayer.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 };

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!

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

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);

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?

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

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

BREAK

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

Homework 14 Thursday: Trip to KitWare