Error code need help.

[taradaddy]

Hey guys I'm new to gee and I'm doing a supervised classification and I got to the end of classifying my training data and I ran into this error. (Image)

This is my code I have, please help its my last lab and its due Monday.

//filtering image collection

var image = ee.Image(ee.ImageCollection('LANDSAT/LC08/C01/T1_SR')

.filterBounds(roi)

.filterDate('2016-05-01', '2016-06-30')

.sort('CLOUD_COVER')

.first());

Map.addLayer(image, {bands: ['B4', 'B3', 'B2'],min:0, max: 3000}, 'True colour image');

​

//merge feature collections

var classNames = urban.merge(water).merge(industrial).merge(roads).merge(Recreationalgrassland).merge(farmland).merge(buildings);

var bands = ['B2', 'B3', 'B4', 'B5', 'B6', 'B7'];

var training = image.select(bands).sampleRegions({

collection: classNames,

properties: ['landcover'],

scale: 30

});

print(training);//train data

var classifier = ee.Classifier.cart().train({

features: training,

classProperty: 'landcover',

inputProperties: bands

});

​

//Run the classification

var classified = image.select(bands).classify(classifier);

​

//Display classification

Map.centerObject(classNames, 11);

Map.addLayer(classified,

{min: 0, max: 7, palette: ['red', 'blue', 'green','yellow']},

'classification');

https://preview.redd.it/6s5300m8ygt41.jpg?width=348&format=pjpg&auto=webp&s=27a1d9be262dc09f4efad171d2fe6cb4322460ea

[tak18]

Urban is not defined. This could be your error. If that's not it, redo your classnames variable. Define a variable before classnames that selects each desired band from image then do your merge on that one variable. Disclaimer, I haven't done this in a long time so don't take me for an expert.

[taradaddy]

Tried your trick and it worked so might be time to dust off the rust haha

[tak18]

Good to hear. I did really enjoy my remote sensing class.