错误运行 AGStoShapefile.js

Question

我已经成功安装了 AGStoShapefile，这是一个 node.js 脚本，可以将 ESRI Geoservices 转换为 geojson 和 shapefile 格式。

github 存储库在这里 https://github.com/tannerjt/AGStoShapefile 我遇到问题的特定 .js 文件是 https://github.com/tannerjt/AGStoShapefile/blob/master/AGStoSHP.js

默认情况下，该脚本采用包含服务的输入 txt 文件并输出 .shp、.json 文件。这个services.txt位于AGStoShapefile目录下，在终端脚本完美运行到第154行，此时出现如下错误：

node AGStoSHP.js
info: Number of features for service:  225
info: Getting chunks of 100 features...
info: query -> 0 out of 225
info: query -> 100 out of 225
info: query -> 200 out of 225
info: Number of features for service:  8258
info: Getting chunks of 100 features...
info: query -> 0 out of 8258
info: query -> 100 out of 8258
info: query -> 200 out of 8258
info: query -> 300 out of 8258
info: query -> 400 out of 8258
info: query -> 500 out of 8258
info: query -> 600 out of 8258
info: query -> 700 out of 8258
info: query -> 800 out of 8258
info: query -> 900 out of 8258

它继续...

info: query -> 7100 out of 8258
info: query -> 7200 out of 8258
info: query -> 7300 out of 8258
info: query -> 7400 out of 8258
info: query -> 7500 out of 8258
info: query -> 7600 out of 8258
info: query -> 7700 out of 8258
info: query -> 7800 out of 8258
info: query -> 7900 out of 8258
info: query -> 8000 out of 8258
info: query -> 8100 out of 8258
info: query -> 8200 out of 8258
info: all requests settled
info: creating WildFire json
info: Creating Esri JSON
info: Creating GeoJSON
info: Creating Shapefile
events.js:154
      throw er; // Unhandled 'error' event
      ^

Error: ENOENT: no such file or directory, open './output/WildFire.json'
    at Error (native)

知道为什么没有创建输出文件吗？我是 node.js

的新手

这是 AGStoSHP.js 文件：

var ogr2ogr = require('ogr2ogr');
var esri2geo = require('esri2geo');
var q = require('q');
var request = q.nfbind(require('request'));
var objectstream = require('objectstream');
var fs = require('fs');
var queryString = require('query-string');
var winston = require('winston');

// Setup logging with winston
winston.level = 'debug';
// winston.add(winston.transports.File, {filename: './logfile.log'});

// ./mixin.js
// merge user query params with default
var mixin = require('./mixin');

var serviceFile = process.argv[2] || 'services.txt';
var outDir = process.argv[3] || './output/';
if(outDir[outDir.length - 1] !== '/') {
    outDir += '/';
}

// Make request to each service
fs.readFile(serviceFile, function (err, data) {
    if (err) {
        winston.info(err);
        throw err;
    }
    data.toString().split('\n').forEach(function (service) {
        var service = service.split('|');
        if(service[0].split('').length == 0) return;
        var baseUrl = getBaseUrl(service[0].trim()) + '/query';

        var reqQS = {
            where: '1=1',
            returnIdsOnly: true,
            f: 'json'
        };
        var userQS = getUrlVars(service[0].trim());
        // mix one obj with another
        var qs = mixin(userQS, reqQS);
        var qs = queryString.stringify(qs);
        var url = decodeURIComponent(getBaseUrl(baseUrl) + '/query/?' + qs);

        request({
            url : url,
            method : 'GET',
            json : true
        }, function (err, response, body) {
            var err = err || body.error;
            if(err) {
                winston.info(err);
                throw err;
            }
            requestService(service[0].trim(), service[1].trim(), body.objectIds);
        });
    })
});

// Resquest JSON from AGS
function requestService(serviceUrl, serviceName, objectIds) {
    objectIds.sort();
    winston.info('Number of features for service: ', objectIds.length);
    winston.info('Getting chunks of 100 features...');
    var requests = [];

    for(var i = 0; i < Math.ceil(objectIds.length / 100); i++) {
        var ids = [];
        if ( ((i + 1) * 100) < objectIds.length ) {
            ids = objectIds.slice(i * 100, (i * 100) + 100);
        } else {
            ids = objectIds.slice(i * 100, objectIds[objectIds.length]);
        }

        if(ids[0] !== undefined) {
            winston.info('query ->', (i * 100) , 'out of', objectIds.length);
        } else {
            winston.info('wait for requests to settle...');
            continue;
        }

        // we need these query params
        var reqQS = {
            objectIds : ids.join(','),
            geometryType : 'esriGeometryEnvelope',
            returnGeometry : true,
            returnIdsOnly : false,
            outFields : '*',
            outSR : '4326',
            f : 'json'
        };
        // user provided query params
        var userQS = getUrlVars(serviceUrl);
        // mix one obj with another
        var qs = mixin(userQS, reqQS);
        var qs = queryString.stringify(qs);
        var url = decodeURIComponent(getBaseUrl(serviceUrl) + '/query/?' + qs);
        var r = request({
            url : url,
            method : 'GET',
            json : true
        });

        requests.push(r);
    };

    q.allSettled(requests).then(function (results) {
        winston.info('all requests settled');
        var allFeatures;
        for(var i = 0; i < results.length; i++) {
            if(i == 0) {
                allFeatures = results[i].value[0].body;
            } else {
                allFeatures.features = allFeatures.features.concat(results[i].value[0].body.features);
            }
        }
        winston.info('creating', serviceName, 'json');
        var json = allFeatures;

        //esri json
        winston.info('Creating Esri JSON');
        var stream = fs.createWriteStream(outDir + serviceName + '.json');
        var objstream = objectstream.createSerializeStream(stream);
        objstream.write(json);
        objstream.end();

        //geojson
        winston.info('Creating GeoJSON');
        var stream = fs.createWriteStream(outDir + serviceName + '.geojson');
        var objstream = objectstream.createSerializeStream(stream);
        esri2geo(json, function (err, data) {
            if(err) {
                throw(err);
                winston.info('Error converting esri json to geojson');
                return;
            }
            objstream.write(data);
            objstream.end();
            winston.info('Creating Shapefile');
            //shapefile
            var shapefile = ogr2ogr(data)
                .format('ESRI Shapefile')
                .options(['-nln', serviceName])
                .skipfailures();
            shapefile.stream().pipe(fs.createWriteStream(outDir + serviceName + '.zip'));
        });

    }).catch(function (err) {
        winston.info(err);
        throw err;
    });
}


//
function getUrlVars(url) {
    var vars = {}, hash;
    var hashes = url.slice(url.indexOf('?') + 1).split('&');
    for(var i = 0; i < hashes.length; i++)
    {
        hash = hashes[i].split('=');
        vars[hash[0].toString()] = hash[1];
    }
    return vars;
}

// get base url for query
function getBaseUrl(url) {
    // remove any query params
    var url = url.split("?")[0];
    if((/\/$/ig).test(url)) {
        url = url.substring(0, url.length - 1);
    }
    return url;
}

Answer 1

我是那个 GitHub 存储库的维护者。该脚本假定输出文件夹已创建。您可以尝试创建一个名为 output 的文件夹，或手动指定您自己的输出位置和输入服务文本文件，如下所示：

node AGStoSHP.js services.txt ./myotherfolder/

错误运行 AGStoShapefile.js

error running AGStoShapefile.js

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错误 运行 AGStoShapefile.js

error running AGStoShapefile.js

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错误运行 AGStoShapefile.js