diff --git a/adapters/sequence/README.md b/adapters/sequence/README.md
new file mode 100644
index 0000000..63b5fc5
--- /dev/null
+++ b/adapters/sequence/README.md
@@ -0,0 +1,3 @@
+- make a new guy if the # is too large for a sequence
+- if the distnace is too close, skip adding that image.
+- or if when checking distance and time, one of them is greater than the max
\ No newline at end of file
diff --git a/adapters/sequence/build.js b/adapters/sequence/build.js
index 8dff4a3..958af13 100644
--- a/adapters/sequence/build.js
+++ b/adapters/sequence/build.js
@@ -7,10 +7,7 @@ Promise = require('bluebird');
 
 module.exports = (images, params) => {
     return Promise.map(images, async (image) => await meta(image))
-    .then(metas => {
-        const sortedMetas = metas.sort((a, b) => a.date - b.date);
-        return split(sortedMetas)
-    })
+    .then(async metas => await split(metas, params))
     .catch(e => { throw e; })
     
 }
\ No newline at end of file
diff --git a/adapters/sequence/helpers.js b/adapters/sequence/helpers.js
index c3bf881..e6c0022 100644
--- a/adapters/sequence/helpers.js
+++ b/adapters/sequence/helpers.js
@@ -13,12 +13,10 @@ const uuidv4 = require('uuid/v4');
  * @return {number} euclidean distance between two points
  */
 exports.calcDistance = (metaLoc, nextMetaLoc) => {
-    return distance(
-        point([metaLoc.lon, metaLoc.lat]),
-        point([metaLoc.lon, metaLoc.lat])
-        // { units: 'miles'}
+    return Math.sqrt(
+        Math.pow(nextMetaLoc.lon - metaLoc.lon, 2) + 
+        Math.pow(nextMetaLoc.lat - metaLoc.lat, 2)
     )
-
 }
 
 /**
@@ -29,7 +27,7 @@ exports.calcDistance = (metaLoc, nextMetaLoc) => {
  * @return {number} milisecond diff between two dates.ee
  * 
  */
-exports.calcDelta = (metaDate, nextMetaDate) => metaDate.diff(nextMetaDate);
+exports.calcDelta = (metaDate, nextMetaDate) => nextMetaDate.diff(metaDate) / 1000;
 
 /**
  * given a sequence map, adds a new sequence array and returns the map.
@@ -38,19 +36,4 @@ exports.calcDelta = (metaDate, nextMetaDate) => metaDate.diff(nextMetaDate);
  * @param {array} sequence sequence to be added to sequenceMap
  * @return {object} updated sequenceMap
  */
-exports.addSequence = (sequenceMap, sequence) => { sequenceMap[uuidv4()] = sequence; return sequenceMap };
-
-/**
- * given thwo partner meta objects, determines if the two are within user defined time/distnace thresholds
- * 
- * @param {object} meta metadata object at current index of images
- * @param {object} partnerMeta metadata object for (either next or previous) partner meta object
- */
-exports.withinThresholds = (meta, partnerMeta) => {
-    const distance = calcDistance(meta.loc, nextMeta.loc);
-          delta = calcDelta(meta.timestamp, nextMeta.timestamp),
-          toMuchTime = delta > maxDelta
-          toFar = distance > maxDistance;
-
-    return !toFar && !toMuchTime;
-}
\ No newline at end of file
+exports.addSequence = (sequenceMap, sequence) => { sequenceMap[uuidv4()] = sequence; return sequenceMap };
\ No newline at end of file
diff --git a/adapters/sequence/index.js b/adapters/sequence/index.js
index 0a67085..f0f7c0b 100644
--- a/adapters/sequence/index.js
+++ b/adapters/sequence/index.js
@@ -25,12 +25,13 @@ module.exports = (paths, cutDist, cutTime, cutSize) => {
         .then(async (images) => {
             try {
                 const params = { 
-                          dist: cutDist || 0, 
-                          detla: cutTime || 0, 
+                          maxDist: cutDist || 0.2,
+                          minDist: 0.1,
+                          maxDetla: cutTime || 120, 
                           size: cutSize || 0 
                       },
                       sequences = await buildSequences(flatten(images), params);
-                
+
                 resolve(sequences);
             } catch (e) {
                 reject(e);
diff --git a/adapters/sequence/meta.js b/adapters/sequence/meta.js
index 74387d9..1902ebb 100644
--- a/adapters/sequence/meta.js
+++ b/adapters/sequence/meta.js
@@ -15,8 +15,7 @@ Promise = require('bluebird');
  */
 module.exports = (image) => {
     return new Promise((resolve, reject) => 
-        exif
-        .read(image)
+        exif.read(image)
         .then(tags => {
             resolve({ 
                 image: image,
diff --git a/adapters/sequence/split.js b/adapters/sequence/split.js
index 49b8bda..e713dc1 100644
--- a/adapters/sequence/split.js
+++ b/adapters/sequence/split.js
@@ -3,47 +3,57 @@
 
 const calcDistance = require('./helpers').calcDistance;
 const calcDelta = require('./helpers').calcDelta;
-const addSequence = require('helpers').addSequence
-const withinThresholds = require('helpers').withinThresholds;
+const addSequence = require('./helpers').addSequence
 
 Promise = require('bluebird');
 
 /**
- * provided list of image metadata objects and thresholds for  
+ * provided list of image metadata objects and thresholds used to define sequences,
+ * build and reply an object of image sequences
+ * 
+ * @param metas {list} list of image metadata objects
+ * @param params {object} map of user (or default) tresholds used to build sequences
+ * @return {object} map of generated image sequences
+ * 
  */
 module.exports = (metas, params) => {
     const sortedMetas = metas.sort((a, b) => a.timestamp - b.timestamp),
           pelIndex = sortedMetas.length - 2,
           lastIdx = sortedMetas.length - 1,
           sequences = {},
-          sequenceless = [];
-          maxDist = params.dist,
-          maxDelta = params.delta,
-          maxSize = params.maxSize;
+          sequenceless = [],
+          maxDist = params.maxDist,
+          maxDelta = params.maxDelta,
+          maxSize = params.maxSize,
+          minDist = params.minDist;
 
     let currentSequence = [];
-
-    Promise.all(sortedMetas, (meta, i) => {
-        if (currentSequence.length === maxSize) {
-            sequences = addSequence({}, currentSequence);
-            currentSequence = [];
-
-        }
-
-        const partnerMeta = sortedMetas[i + (i <= pelIndex ? 1 : -1)],
-              meetsThreshold = withinThresholds(meta, partnerMeta);
-
-        if (meetsThreshold) {
+    // for the 1st to 2nd to last meta...
+    sortedMetas.slice(0, pelIndex).forEach((meta, i) => {
+        const partnerMeta = sortedMetas[i + 1],
+              distance = calcDistance(meta.loc, partnerMeta.loc),
+              tooClose = false;
+            //   tooClose = distance < minDist;
+        
+        // ... if image is not too close to its partner, add it to a sequence.
+        if (!tooClose) {
+            // ... if the current sequence length matches the maximum size,
+            //     or images are too far apart (in space or time), 
+            //     add the current sequence to the sequence map, then make a new sequence.
+            const delta = calcDelta(meta.timestamp, partnerMeta.timestamp),
+                  needNewSequence = currentSequence.length === maxSize || distance > maxDist || delta > maxDelta;
+
+            if (needNewSequence) {
+                addSequence(sequences, currentSequence);
+                currentSequence = [];
+
+            }
+            
             currentSequence.push(meta);
 
-        } else {
-            sequenceless.push(meta);
-        }
-        
-    })
-    .then(() => {
-        return { sequences: sequences, sequenceless: sequenceless}
+        }  
     })
-    
 
+    if (currentSequence.length > 0) addSequence(sequences, currentSequence);
+    return sequences;
 };
\ No newline at end of file
diff --git a/schema/index.js b/schema/index.js
index 8b4e6d5..e43129a 100644
--- a/schema/index.js
+++ b/schema/index.js
@@ -1,5 +1,6 @@
 'use strict';
 
 module.exports = {
-    metadata: require('./metadata')
+    metadata: require('./metadata'),
+    sequences: require('./sequences')
 }
\ No newline at end of file
diff --git a/schema/metadata.js b/schema/metadata.js
index ca6e199..65d9011 100644
--- a/schema/metadata.js
+++ b/schema/metadata.js
@@ -33,9 +33,6 @@ const locSchema = Joi
  * invalid: '2008-9-23T14:27:07.240Z'
  */
 const timeStampSchema = Joi.object();
-// Joi
-//     .string()
-//     .regex(/([1-2]{1}[0-9]{3})-([0-1]{1}[0-9]{1})-([0-3]{1}[0-9]{1})T([0-2]{1}[0-9]{1}):([0-6]{1}[0-9]{1}):([0-6]{1}[0-9]{1}).[0-9]{3}Z/)
 
 module.exports = Joi
     .object()
@@ -46,6 +43,6 @@ module.exports = Joi
     })
     .requiredKeys(
         'image',
-        'loc'
-        // 'timestamp'
+        'loc',
+        'timestamp'
     )
\ No newline at end of file
diff --git a/schema/sequences.js b/schema/sequences.js
new file mode 100644
index 0000000..9048b85
--- /dev/null
+++ b/schema/sequences.js
@@ -0,0 +1,12 @@
+'use strict';
+
+const Joi = require('joi');
+const metadata = require('./metadata');
+
+module.exports = Joi
+    .object()
+    .pattern(
+        // uuid regex;
+        /^[0-9A-F]{8}-[0-9A-F]{4}-4[0-9A-F]{3}-[89AB][0-9A-F]{3}-[0-9A-F]{12}$/i, 
+        Joi.array().items(metadata)
+    );
\ No newline at end of file
diff --git a/test/adapters/sequencerSpec.js b/test/adapters/sequencerSpec.js
index 744f9d6..c1abbe9 100644
--- a/test/adapters/sequencerSpec.js
+++ b/test/adapters/sequencerSpec.js
@@ -7,6 +7,7 @@ const Joi = require('joi');
 
 /* schemas that define valid/expected function outputs */
 const metadataSchema = require('../../schema').metadata;
+const sequencesSchema = require('../../schema').sequences;
 
 /* seqeunce adapter components */
 const meta = require('../../adapters/sequence/meta');
@@ -33,9 +34,11 @@ describe('sequence', () => {
     it ('given a path of images, generates a list of sequence objects', async () => {
         try {
             const paths = ['/testData/exif-gps-samples'].map(p => process.cwd() + p),
-                  sequences = await sequenceAdapter(paths);
+                  sequences = await sequenceAdapter(paths),
+                  validation = Joi.validate(sequences, sequencesSchema);
 
-                  console.log(sequences)
+            expect(validation.value).to.be.eql(sequences)
+            expect(validation.error).to.be.null;
 
         } catch (e) {
             console.error(e);