2a:null 2b:["$","title",null,{"children":"Northwest Louisiana Historic Maps | mradamcox | Observable"}] 30:Ta97,map = { let container = DOM.element('div', { style: `width:${width}px;height:${width/1.6}px` }); yield container; // Now we create a map object let map = L.map(container,{ fullscreenControl: true }).setView([31.6993, -93.1462], 10); let latlongpopup = L.popup({'className' : 'latlong-popup'}); map.on("contextmenu", function (event) { let latitude = event.latlng.lat.toFixed(4); let longitude = event.latlng.lng.toFixed(4); let gm = 'http://maps.google.com/maps?z=7&t=k&q=loc:'+latitude+'+'+longitude; let gmlink = '
view in google maps' latlongpopup .setLatLng(event.latlng) .setContent(latitude+', '+longitude+'
zoom level: '+map.getZoom()+gmlink) .openOn(map); }); let baseLayers = makeBaseLayers() baseLayers["Satellite"].addTo(map) let overlayLayers = makeOverlayLayers() overlayLayers["Confederate Parish Maps"].addTo(map) let c_layers = new L.control.layers(baseLayers, overlayLayers,{position:'topright',autoZIndex:true}); map.addControl(c_layers); //let c_fullscreen = new L.fullscreen({position:'bottomright'}); //map.addControl(c_fullscreen); function switchOverlay(layername) { for (var key in overlayLayers) { if (overlayLayers.hasOwnProperty(key)) { let olayer = overlayLayers[key]; map.removeLayer(olayer); if (key == layername) { map.addLayer(olayer); } } } } function showPOI(latlong, zoom, layerinfo) { switchOverlay(layerinfo); map.flyTo(latlong, zoom); } document.getElementById("opacity-slider").oninput = function () { let newopacity = this.value/100 overlayLayers["Confederate Parish Maps"].eachLayer(function (layer) { if (layer.options.layers == "crnha:confedmaps_full") {layer.setOpacity(newopacity)} }); }; document.getElementById("high-pressure-note").onclick = function () { showPOI([31.7661, -92.8074], 13, "Confederate Parish Maps"); }; document.getElementById("mershon-commence").onclick = function () { showPOI([31.7499, -93.0824], 15, "Confederate Road Survey - Natchitoches/Alexandria"); }; document.getElementById("camp-mershon").onclick = function () { showPOI([31.7665, -93.1068], 14, "Confederate Parish Maps") }; document.getElementById("horsepen").onclick = function () { showPOI([31.5990, -93.1886], 15, "Confederate Parish Maps") }; document.getElementById("jas-maddin").onclick = function () { showPOI([31.4615, -93.1278], 15, "Historic Plats Mosaic") }; document.getElementById("railroad").onclick = function () { showPOI([31.5204, -93.0335], 16, "no-layer") }; } 31:T5c6,function makeOverlayLayers() { let confed_maps_full = L.tileLayer.wms("https://gn.legiongis.com/geoserver/ows", { layers: 'rg77z33:confedmaps_full', format: 'image/png', transparent: true, attribution: "see below for more info", tiled: true, maxZoom:19, }); let confed_maps_trans = L.tileLayer.wms("https://gn.legiongis.com/geoserver/ows", { layers: 'rg77z33:confedmaps_trans', format: 'image/png', transparent: true, attribution: "see below for more info", tiled: true, maxZoom:19, }); var confed_map_composite = L.layerGroup([confed_maps_trans, confed_maps_full]); let roadmap = L.tileLayer('https://tiles.legiongis.com/civilwarroadmap/{z}/{x}/{y}.png', { attribution: "see below for more info", }); let roadmap2 = L.tileLayer('https://legion-maps.us-southeast-1.linodeobjects.com/tiles/civilwarroadmap/{z}/{x}/{y}.png', { attribution: "see below for more info", }); let plats = L.tileLayer('https://tiles.legiongis.com/historictownplats/{z}/{x}/{y}.png', { attribution: "see below for more info", }); let overlayLayers = { //"Confederate Parish Maps - Color":confed_maps_full, //"Confederate Parish Maps - Transparent":confed_maps_trans, "Confederate Parish Maps": confed_map_composite, "Confederate Road Survey - Natchitoches/Alexandria": roadmap, "new address": roadmap2, "Historic Plats Mosaic": plats, }; return overlayLayers }32:[] 2e:{"id":"44ba55635bd35cfd","slug":"northwest-louisiana-historic-maps","title":"Northwest Louisiana Historic Maps","thumbnail":"613beda2c5fc959f6798a2781baec3218db8e08cbe895c78c92a57d8744ecf57","access_level":"public","create_time":"$D2019-05-15T17:32:21.290Z","update_time":"$D2024-02-17T16:10:52.949Z","view_time":null,"first_public_time":"$D2019-05-15T19:18:34.247Z","fork":false,"stars":0,"starred":false,"owner":{"type":"team","id":"0ae73f6174cae4c3","login":"mradamcox","name":"","avatar_url":"https://avatars-next.observableusercontent.com/748562e30e1ea8d52d99446db67cf5bcf90ff0dff6c65ab473a44a444958ee6a","tier":"starter_2024"},"version":389,"publish_version":null,"role":null,"authored":false,"authors":[{"type":"individual","id":"826f0155b2644262","login":"mradamcox","name":"","avatar_url":"https://avatars-next.observableusercontent.com/748562e30e1ea8d52d99446db67cf5bcf90ff0dff6c65ab473a44a444958ee6a","tier":null}],"members":[{"type":"individual","id":"826f0155b2644262","login":"mradamcox","name":"","avatar_url":"https://avatars-next.observableusercontent.com/748562e30e1ea8d52d99446db67cf5bcf90ff0dff6c65ab473a44a444958ee6a","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"subscribed":null,"forks":0,"collection":{"id":"70cfd9ccf13be446","slug":"exploration","title":"exploration","owner":{"id":"0ae73f6174cae4c3","login":"mradamcox","name":""}},"type":"notebook","body":{"title":"Northwest Louisiana Historic Maps","cells":[{"id":0,"value":"md`# Northwest Louisiana Historic Maps`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":21,"value":"md`This webmap displays various map layers originally created for the Cane River Heritage Inventory & Map, an installation of [Arches](http://archesproject.org) (version 3) I created for the Cane River National Heritage Area in 2015. The real database has been decommissioned.\n\nAll of the layers in the webmap below (besides the Open Street Map and Satellite layers) were originally created for publication as overlays in the \"map view\" of that Arches database.\n\nFurther information about each layer is provided below the map.`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":107,"value":"md`##### Georeferencing Disclaimer\n\n_There are two main issues with the interpretation of historic maps:_\n\n+ _The maps themselves may be inaccurate or approximate._\n+ _Placing them on current maps is not precise._\n\n_Please be aware of these limitations as you view the historic layers in the map. Any property lines or markings on the ground take precedence over what is displayed here._`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":354,"value":"fullscreen = {\n const button = html`\n \n `;\n button.onclick = () => button.parentElement.nextElementSibling.requestFullscreen();\n return button;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":11,"value":"$30","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":119,"value":"html`\n

\n \n \n \n \n \n \n

\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":191,"value":"slider = html`

Confederate Parish Maps - Background Opacity

`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":54,"value":"md`#### Hillshade / Hillshade + Elevation\n\nThese layers are hillshade derivatives of LiDAR data distributed by [Atlas: The Louisiana Statewide GIS](https://maps.ga.lsu.edu/lidar/), which was produced for the [Louisiana State LiDAR Project](http://atlas.lsu.edu/central/la_lidar_project.pdf), maintained by the LSU Department of Geography and Anthropology, Baton Rouge, LA. For the colored layer, elevation and hillshade renderings were combined in TileMill.`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":61,"value":"md`#### USGS Topo\n\nThis is a seamless mosaic of 24k USGS Quads, obtained through the [NRCS Geospatial Data Gateway](http://datagateway.nrcs.usda.gov/).`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":6,"value":"\nmd`#### Confederate Parish Maps\n\nThese maps are from the [Civil Works Map File, Record Group 77, Z-33](https://research.archives.gov/id/5900024) in the National Archives. They are described as \"Captured Confederate Maps\". Each scan was cropped/edited in GIMP then georeferenced in ArcMap. Further image editing was carried out in GIMP to create a transparent background version of each file.\n\nSee: https://catalog.archives.gov/search?q=*:*&f.parentNaId=7491472&f.level=item&sort=naIdSort%20asc&offset=200`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":71,"value":"md`#### Confederate Road Survey\n\nThis layer is a continuous mosaic (created by Ed FitzGerald at NCPTT) of a road survey from the Civil Works Map File described above. The original survey extends all the way to Alexandria, but only the portion within Natchitoches Parish was mosaicked and georeferenced. During a visit to the National Archives, College Park, MD location in 2019 I found that there are over a dozen of these surveys, connecting many different locations in NW Louisiana. The nodes of this network are shown below (those in red are only approximately located).\n\n\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":87,"value":"md`#### Historic Plats Mosaic\n\nThis layer comprises many historic township plat maps from the Louisiana [Office of State Land historical document portal](https://wwwslodms.doa.la.gov/). These plat maps are not all from the same year, so the date of each has been added in the northeast corner of the township. Image editing was carried out in GIMP to crop and remove the background from each plat. They were georeferenced to the USGS seamless topo basemap layer (distributed by USGS via NRCS).`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":351,"value":"html`

`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":292,"value":"md`#### Import Leaflet and Set Styles`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":13,"value":"L = require('leaflet@1.3.1')","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":15,"value":"html``","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":179,"value":"html`\n`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":286,"value":"md`#### Define Commonly Used Variables`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":199,"value":"import {mapbox_access_token} from \"@mradamcox/resources\"","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":281,"value":"md`#### Define All Layers`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":224,"value":"function makeBaseLayers() {\n \n let styleId = 'legiongis/cj1guln72000b2snltuuyge8r';\n let basic = L.tileLayer('https://api.mapbox.com/styles/v1/'+styleId+'/tiles/256/{z}/{x}/{y}?access_token='+mapbox_access_token\n );\n\n let mapbox_satellite = L.tileLayer('https://{s}.tiles.mapbox.com/v4/mapbox.satellite/{z}/{x}/{y}.png?access_token='+mapbox_access_token, {\n attribution: \"© Mapbox\",\n });\n \n let hs = L.tileLayer('https://tiles.legiongis.com/hillshade/{z}/{x}/{y}.png', {\n attribution: \"see below for more info\",\n });\n \n let hs_elev = L.tileLayer('https://tiles.legiongis.com/relief_basemap/{z}/{x}/{y}.png', {\n attribution: \"see below for more info\",\n });\n \n let usgs = L.tileLayer('https://tiles.legiongis.com/drg/{z}/{x}/{y}.png', {\n attribution: \"USGS\",\n });\n \n let baseLayers = {\n \"Open Street Map\":basic,\n \"Satellite\":mapbox_satellite,\n \"Hillshade\": hs,\n \"Hillshade + Elevation\": hs_elev,\n \"USGS Topo\": usgs,\n };\n \n return baseLayers\n}\n ","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":239,"value":"$31","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"}],"files":"$W32","stdlib":"1","titling":"auto"}} 2f:"$2e:body"