Trying to mine data from FEMA National Flood Hazard Layer

parse-fema.js

var fs = require("fs"),
    _ = require("underscore"),
    request = require("request"),
    baseUrl = "https://hazards.fema.gov/gis/nfhl/rest/services/public/NFHL/MapServer/28",
    outEsri = JSON.stringify({"displayFieldName":"DFIRM_ID","fieldAliases":{"FLD_ZONE":"FLD_ZONE","ZONE_SUBTY":"ZONE_SUBTY"},"fields":[{"name":"FLD_ZONE","type":"esriFieldTypeString","alias":"FLD_ZONE","length":17},{"name":"ZONE_SUBTY","type":"esriFieldTypeString","alias":"ZONE_SUBTY","length":57}]}),
    outFile = fs.createWriteStream("fema-get-all-esri.json");

outFile.write(outEsri + ",features:[");

request(baseUrl + "?f=json", function (err, response, information) {
    if (err) {throw err; return;}
    var info = JSON.parse(information),

        wanted = _.filter(info.drawingInfo.renderer.uniqueValueInfos, function (symbol) {
            return symbol.label === "1% Annual Chance Flood Hazard" || symbol.label === "0.2% Annual Chance Flood Hazard";
        }),

        params = _.map(wanted, function (symbol) {
            var parts = symbol.value.split(", "),
                fld = parts[0] === "<Null>" ? "+is+Null" : "%3D'" + parts[0] + "'";
                sub = parts[1] === "<Null>" ? "+is+Null" : "%3D'" + parts[1] + "'";
            return "&where=FLD_ZONE" + fld + "+and+ZONE_SUBTY" + sub;
        }),

        queryUrl = baseUrl + "/query?f=json&geometryType=esriGeometryEnvelope&geometry=-114.97192382812499,31.302021690136105,-108.77014160156249,37.13842453422676&inSR=4326&spatialRel=esriSpatialRelIntersects&returnGeometry=true&outFields=FLD_ZONE,ZONE_SUBTY&outSr=4326";

    params.forEach(function (where) {
        request(queryUrl + where, function (err, response, data) {
            if (err) {throw err; return;}
            var esriJson = JSON.parse(data);
            if (esriJson.exceededTransferLimit) {
                console.log("\n" + where + " exceeded transfer limit");
            } else {
                esriJson.features.forEach(function (feature) {
                    outFile.write(JSON.stringify(feature) + ",");
                })
            }
        });
    })
});